AT43USB325E-AC
AT43USB325E-AC Datasheet
The Atmel AT43USB325 is an 8-bit microcontroller based on the AVR RISC architecture. By executing powerful instructions in a single clock cycle, the AT43USB325 achieves throughputs approaching 12 MIPS. The AVR core combines a rich instruction set with 32 general-purpose working registers. All 32 registers are directly connected to the ALU allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.
| Part | Datasheet |
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AT43USB325E-AC |
AT43USB325E-AC (pdf) |
| Related Parts | Information |
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AT43USB325E-AU |
AT43USB325E-AU |
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| • 8-bit RISC Microcontroller with 83 ns Instruction Cycle Time • USB Hub with One Attached and Four External Ports • USB Keyboard Function with Four Programmable Endpoints • 16 KB Program Memory, 512-Byte Data SRAM • 32 x 8 General-purpose Working Registers • 42 Programmable I/O Port Pins • Support for 20 x 8 Keyboard Matrix • Keyboard Scan Inputs with Pull-up Resistor • Four LED Driver Outputs • One 8-bit Timer/Counter with Separate Pre-scaler • One 16-bit Timer/Counter with Separate Pre-scaler and Dual 8-, 9- or 10-bit PWM • External and Internal Interrupt Sources • Programmable Watchdog Timer • 6-MHz Oscillator with On-chip PLL • 5V Operation with On-chip 3.3V Power Supply • 64-lead LQFP Package The Atmel AT43USB325 is an 8-bit microcontroller based on the AVR RISC architecture. By executing powerful instructions in a single clock cycle, the AT43USB325 achieves throughputs approaching 12 MIPS. The AVR core combines a rich instruction set with 32 general-purpose working registers. All 32 registers are directly connected to the ALU allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. The AT43USB325 features an on-chip 16-Kbyte program memory and 512 bytes of data memory. It is supported by a standard set of peripherals such as timer/counter modules, watchdog timer and internal and external interrupt sources. The major peripheral included in the AT43USB325 is the USB Hub with an embedded function and GPIO ports designed for use in a keyboard controller. The embedded function has 4 endpoints that makes the AT43USB325 extremely suitable for keyboards supporting the consumer page as described in the “USB Usage Tables”. The AT43USB325 comes in two versions. The program memory of the AT43USB325E is an SRAM that is automatically written from an external serial EEPROM during power on. The AT43USB325M has a masked ROM program memory. The two versions are pin, function and binary compatible. Multimedia USB Keyboard Controller with Embedded Hub AT43USB325 Pin Configuration Figure 64-lead LQFP AT43USB325E-AC PD3 1 PD1 2 PD0 3 DP0 4 DM0 5 DP2 6 DM2 7 DP3 8 DM3 9 VCC1 10 CEXT1 11 VSS1 12 DP4 13 DM4 14 DP5 15 DM5 16 Figure 64-lead LQFP AT43USB325M-AC PD3 1 PD1 2 PD0 3 DP0 4 DM0 5 DP2 6 DM2 7 DP3 8 DM3 9 VCC1 10 CEXT1 11 VSS1 12 DP4 13 DM4 14 DP5 15 DM5 16 2 AT43USB325 RESETN 17 TEST 18 PC7 19 PC6 20 PC5 21 PC4 22 PC3 23 PC2 24 PC1 25 PC0 26 PD7 27 PD6 28 PD5 29 PD4 30 PF3 31 PF2 32 64 PA0 63 PA1 62 PA2 61 PA3 60 PA4 59 PA5 58 PA6 57 PA7 56 PB0 55 PB1 54 PB2 53 PB3 52 PB4 51 PB5 50 PB6 49 PB7 RESETN 17 TEST 18 PC7 19 PC6 20 PC5 21 PC4 22 PC3 23 PC2 24 PC1 25 PC0 26 PD7 27 PD6 28 PD5 29 PD4 30 MISO 31 MOSI 32 64 PA0 63 PA1 62 PA2 61 PA3 60 PA4 59 PA5 58 PA6 57 PA7 56 PB0 55 PB1 54 PB2 53 PB3 52 PB4 51 PB5 50 PB6 49 PB7 48 PE0 47 PE1 46 PE2 45 PE3 44 LFT 43 XTAL2 42 XTAL1 41 VSS2 40 CEXT2 39 VCC2 38 PE4 37 PE5 36 PE6 35 PE7 34 SSN 33 SCK 48 PE0 47 PE1 46 PE2 45 PE3 44 LFT 43 XTAL2 42 XTAL1 41 VSS2 40 CEXT2 39 VCC2 38 PE4 37 PE5 36 PE6 35 PE7 34 NC 33 PF1 Pin Assignment Pin# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Signal PD3 PD1 PD0 DP0 DM0 DP2 DM2 DP3 DM3 VCC1 CEXT1 VSS1 DP4 DM4 DP5 DM5 RESETN TEST PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 PD7/INTD PD6/INTC PD5/INTB PD4/INTA PF3/SO/ICP PF2/SI/OC1B Type Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Power Supply/Ground Output Power Supply/Ground Bi-directional Bi-directional Bi-directional Bi-directional Input Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional AT43USB325 Pin# 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Signal PF1/SCK/OC1A NC/SSN PE7 PE6 PE5 PE4 VCC2 CEXT2 VSS2 XTAL1 XTAL2 LFT PE3 PE2 PE1 PE0 PB7 PB6 PB5 PB4 PB3 PB2 PB1 PB0 PA7 PA6 PA5 PA4 PA3 PA2 PA1 PA0 Type Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Power Supply/Ground Output Power Supply/Ground Input Output Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Bi-directional Signal Description Name VCC1, 2 Type Power Supply/Ground CEXT1, 2 Output VSS1, 2 XTAL1 XTAL2 Power Supply/Ground Input Output Input Ordering Information Standard Package Options Program Memory Ordering Code SRAM AT43USB325E-AC Package 64AA LQFP Green Package Options Pb/Halide-free/RoHS Compliant Program Memory Ordering Code Package SRAM AT43USB325E-AU 64AA LQFP AT43USB325 Operation Range Commercial 0°C to 70°C Operation Range Green, Industrial -40°C to 85°C 64AA Package Type 64-lead, Low-profile mm Plastic Quad Flat Package LQFP Packaging Information 64AA LQFP Dimensions in Millimeters and Inches Controlling Dimensions Millimeters JEDEC STANDARD MS-026 ACB PIN 1 ID PIN 1 1121..2755 00..449623 SQ 190..9100 00..338997 SQ MAX TITLE 2325 Orchard Parkway 64AA, 64-lead, Low-profile mm Plastic Quad Flat R San Jose, CA 95131 Package LQFP 104 AT43USB325 64AA AT43USB325 Errata Sheet Errata All Date Codes Missed Watchdog Timer Reset Problem There is a synchronization problem between the watchdog clock and the AVR clock. Even though the clock inputs to both the watchdog timer and the AVR core are generated through the same crystal, the two clock sources are not going through the same PLL. The AVR is clocked at 12 MHz and the watchdog timer is clocked at 1MHz. The WDR Watchdog Reset instruction is a one-clock-cycle instruction. As such, when a watchdog timer reset occurs due to a WDR, the watchdog timer may miss the reset. This happens frequently if the AVR is clocked much faster than the watchdog timer. Fix/Workaround A workaround is to invoke the WDR repetitively to ensure that the watchdog timer will be able to receive the reset signal. If the AVR runs at 12 MHz, the WDR command must be invoked fourteen times back to back. The following is the sample code for resetting and arming the watchdog timer, assuming the AVR is running at 12 MHz: asm "ldi out 0x21,r16 " ; To disarm and disable the watchdog, do the following: asm "ldi out 0x21,r17 " Please note that if the AVR runs at 24 MHz, the WDR should be invoked twenty-six times. Change Log 3355B Comments • Change Changes in the “Standard Package Options” on page 103 • Additions Added numbering to document headings • Data Correction timeout period data in Table 6-8 on page • Additions Addions to Table 3-4 on page Added an “Errata Sheet” on page 105, a “Change Log” on page 106, and a “Table of Contents” on page i. 106 AT43USB325 AT43USB325 Table of Contents Features 1 Description 1 1.1Pin Configuration 1.2Pin Assignment 1.3Signal Description 2 Architectural Overview 7 3 General-purpose Register File 9 3.1X-, Y- and Z- Registers 3.2Arithmetic Logic Unit ALU 3.3Program Memory 3.4SPI Serial EEPROM Interface AT43USB325E Only 3.5SRAM Data Memory 3.6I/O Memory 3.7USB Hub 10 Ordering Information 103 10.1Standard Package Options 10.2Green Package Options Pb/Halide-free/RoHS Compliant 11 Packaging Information 104 11.164AA LQFP 12 Errata Sheet 105 12.1Problem 12.2Fix/Workaround 13 Change Log 106 Table of i ii AT43USB325 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel 41 26-426-5555 Fax 41 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel 852 2721-9778 Fax 852 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel 81 3-3523-3551 Fax 81 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 436-4314 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel 1 408 441-0311 Fax 1 408 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel 33 2-40-18-18-18 Fax 33 2-40-18-19-60 ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France Tel 33 4-42-53-60-00 Fax 33 4-42-53-60-01 1150 East Cheyenne Mtn. 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