SH79F3283PSLASH032PR datasheet(21/144 Pages) SINOWEALTH

21 / 144 page

SH79F3283

Normal Function

7.1 CPU

7.1.1 CPU Core SFR

Feature

 CPU core registers: ACC, B, PSW, SP, DPL, DPH

Accumulator

ACC is the Accumulator register. Instruction system adopts A as mnemonic symbol of accumulator.

B Register

The B register is used during multiply and divide operations. For other instructions it can be treated as another scratch pad

Stack Pointer (SP)

The Stack Pointer Register is 8 bits special register, It is incremented before data is stored during PUSH, CALL executions and

it is decremented after data is out of stack during POP, RET, RETI executions. The stack may reside anywhere in on-chip

internal RAM (00H-FFH). On reset, the Stack Pointer is initialized to 07H causing the stack to begin at location 08H.

Program Status Word Register (PSW)

The PSW register contains program status information.

Data Pointer Register (DPTR)

DPTR consists of a high byte (DPH) and a low byte (DPL). Its intended function is to hold a 16-bit address, but it may be

manipulated as a 16-bit register or as two independent 8-bit registers.

Table 7.1 PSW Register

D0H

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

PSW

RS1

RS0

R/W

Reset Value

(POR/WDT/LVR/PIN))

Bit Number

Bit Mnemonic

Description

Carry flag bit

0: no carry or borrow in an arithmetic or logic operation

1: a carry or borrow in an arithmetic or logic operation

Auxiliary Carry flag bit

0: no auxiliary carry or borrow in an arithmetic or logic operation

1: an auxiliary carry or borrow in an arithmetic or logic operation

F0 flag bit

Available to the user for general purposes

4-3

RS[1:0]

R0-R7 Register bank select bits

00: Bank0 (Address to 00H-07H)

01: Bank1 (Address to 08H-0FH)

10: Bank2 (Address to 10H-17H)

11: Bank3 (Address to 18H-1FH)

Overflow flag bit

0: no overflow happen

1: an overflow happen

F1 flag bit

Available to the user for general purposes

Parity flag bit

0: In the Accumulator, the bits whose value is 1 is even number

1: In the Accumulator, the bits whose value is 1 is odd number

SH79F3283P/032PR Datasheet(PDF) 21 Page - SINOWEALTH Electronic Ltd

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