W78L516A 查看數據表（PDF） - Winbond

零件编号

产品描述 (功能)

比赛名单

W78L516A

8-BIT MICROCONTROLLER

Winbond 

W78LE516/W78L516A

5. FUNCTIONAL DESCRIPTION

The W78L516 architecture consists of a core controller surrounded by various registers, four general

purpose I/O ports, one special purpose programmable 4-bits I/O port, 512 bytes of RAM, three

timer/counters, a serial port. The processor supports 111 different opcodes and references both a 64K

program address space and a 64K data storage space.

5.1 RAM

The internal data RAM in the W78L516 is 512 bytes. It is divided into two banks: 256 bytes of

scratchpad RAM and 256 bytes of AUX-RAM. These RAMs are addressed by different ways.

• RAM 0H−7FH can be addressed directly and indirectly as the same as in 8051. Address pointers

are R0 and R1 of the selected register bank.

• RAM 80H−FFH can only be addressed indirectly as the same as in 8051. Address pointers are

R0,

R1 of the selected registers bank.

• AUX-RAM 0H−FFH is addressed indirectly as the same way to access external data memory with

the MOVX instruction. Address pointers are R0 and R1 of the selected register bank and DPTR

register. An access to external data memory locations higher than FFH will be performed with the

MOVX instruction in the same way as in the 8051. The AUX-RAM is disabled after a reset. Setting

the bit 4 in CHPCON register will enable the access to AUX-RAM. When AUX-RAM is enabled the

instructions of "MOVX @Ri" will always access to on-chip AUX-RAM. When executing from

internal program memory, an access to AUX-RAM will not affect the Ports P0, P2, WR and RD .

Example,

CHPENR

CHPCON

MOV

MOV

ORL

MOV

MOV

MOV

MOVX

REG F6H

REG BFH

CHPENR, #87H

CHPENR, #59H

CHPCON, #00010000B

CHPENR, #00H

R0, #12H

A, #34H

@R0, A

; enable AUX-RAM

; Write 34h data to 12h address.

5.2 Timers 0, 1, and 2

Timers 0, 1, and 2 each consist of two 8-bit data registers. These are called TL0 and TH0 for Timer 0,

TL1 and TH1 for Timer 1, and TL2 and TH2 for Timer 2. The TCON and TMOD registers provide

control functions for timers 0, 1. The T2CON register provides control functions for Timer 2. RCAP2H

and RCAP2L are used as reload/capture registers for Timer 2. The operations of Timer 0 and Timer 1

are the same as in the W78C51. Timer 2 is a 16-bit timer/counter that is configured and controlled by

the T2CON register. Like Timers 0 and 1, Timer 2 can operate as either an external event counter or

as an internal timer, depending on the setting of bit C/T2 in T2CON. Timer 2 has three operating

modes: capture, auto-reload, and baud rate generator. The clock speed at capture or auto-reload

mode is the same as that of Timers 0 and 1.

Publication Release Date: November 6, 2006

-7-

Revision A7

Share Link: