W78E051B40PL

W78E051B40PL Datasheet


W78E51B Data Sheet

Part Datasheet
W78E051B40PL W78E051B40PL W78E051B40PL (pdf)
Related Parts Information
W78E051B40DL W78E051B40DL W78E051B40DL
W78E051B40FL W78E051B40FL W78E051B40FL
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W78E51B Data Sheet
8-BIT MICROCONTROLLER

Table of Contents-

GENERAL DESCRIPTION 3 FEATURES 3 PIN CONFIGURATIONS 4 PIN 5 BLOCK DIAGRAM 6 FUNCTIONAL DESCRIPTION 7

New Defined 7 Reduce EMI Emission 8 Watchdog Timer 9 Clock 10 Power 10 11 On-Chip ROM Characteristics 11

Read Operation Output Disable Program Operation Program Verify Operation Erase Operation Erase Verify Operation Program/Erase Inhibit Operation

SECURITY BITS 12 Lock Bit 13 MOVC 13 Encryption 13

ELECREICAL 14 Absolute Maximum Ratings 14 D.C. 14 A.C. Characteristics 15

Clock Input Waveform Program Fetch Data Read Cycle Data Write Port Access Cycle Program Operation

Publication Release Date Sep. 6, 2005

W78E51B

TIMING WAVEFORMS 18 Program Fetch Cycle 18 Data Read 18 Data Write 19 Port Access 19 Program Operation 20

TYPICAL APPLICATION CIRCUITS 21 Expanded External Program Memory and Crystal 21 Expanded External Data Memory and Oscillator 22

PACKAGE DIMENSIONS 23 40-pin DIP 23 44-pin PLCC 23 44-pin PQFP 24

W78E51B

The W78E51B is an 8-bit microcontroller which can accommodate a wider frequency range with low power consumption. The instruction set for the W78E51B is fully compatible with the standard The W78E51B contains an 4K bytes Flash EPROM a 128 bytes RAM four 8-bit bi-directional and bitaddressable I/O ports an additional 4-bit I/O port P4 two 16-bit timer/counters a hardware watchdog timer and a serial port. These peripherals are supported by seven sources two-level interrupt capability. To facilitate programming and verification, the Flash EPROM inside the W78E51B allows the program memory to be programmed and read electronically. Once the code is confirmed, the user can protect the code for security.

The W78E51B microcontroller has two power reduction modes, idle mode and power-down mode, both of which are software selectable. The idle mode turns off the processor clock but allows for continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power consumption. The external clock can be stopped at any time and in any state without affecting the processor.
y Fully static design 8-bit CMOS microcontroller y Wide supply voltage of 4.5V to 5.5V y 128 bytes of on-chip scratchpad RAM y 4 KB On-chip Flash EPROM y 64 KB program memory address space y 64 KB data memory address space y Four 8-bit bi-directional ports
y One extra 4-bit-addressable I/O port, additional INT2 / INT3 available on 44-pin PLCC/QFP package
y Two 16-bit timer/counters y One full duplex serial port UART y Watchdog Timer y Seven sources, two-level interrupt capability y EMI reduction mode y Built-in power management y Code protection mechanism y Packages:
− DIP 40 W78E51B-40 − PLCC 44 W78E51BP-40 − PQFP 44 W78E51BF-40 − Lead Free RoHS DIP 40 W78E051B40DL − Lead Free RoHS PLCC 44 W78E051B40PL − Lead Free RoHS PQFP 44 W78E051B40FL

Publication Release Date Sep. 6, 2005

W78E51B

PIN CONFIGURATIONS
40-Pin DIP W78E51B

P1.0 1 P1.1 2 P1.2 3 P1.3 4 P1.4 5 P1.5 6 P1.6 7 P1.7 8 RST 9 RXD, P3.0 10 TXD, P3.1 11 INT0, P3.2 12 INT1, P3.3 13 T0, P3.4 14 T1, P3.5 15 WR, P3.6 16 RD, P3.7 17 XTAL2 18 XTAL1 19 VSS 20
40 VDD 39 P0.0, AD0 38 P0.1, AD1 37 P0.2, AD2 36 P0.3, AD3 35 P0.4, AD4 34 P0.5, AD5 33 P0.6, AD6 32 P0.7, AD7 31 EA 30 ALE 29 PSEN 28 P2.7, A15 27 P2.6, A14 26 P2.5, A13 25 P2.4, A12 24 P2.3, A11 23 P2.2, A10 22 P2.1, A9 21 P2.0, A8
44-Pin PLCC W78E51BP

N AAAA

T DDDD
3 0123
,, , ,

P PP P PP P
1 11 4V 00 0
4 3 2 10 2D01 2 3

P1.5 P1.6 P1.7 RST RXD, P3.0 INT2, P4.3 TXD, P3.1 INT0, P3.2 INT1, P3.3 T0, P3.4 T1, P3.5
6 5 4 3 2 1 44 43 42 41 40
18 19 20 21 22 23 24 25 26 27 28

PP XXVPPP P
33 TTS4 22 2

AAS.
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Datasheet ID: W78E051B40PL 516624