SN8A1702AX datasheet(27/112 Pages) SONIX

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Preliminary

SN8P1702A/SN8P1703A

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 27

Revision 0.5

R REGISTERS

There are two major functions of the R register. First, R register can be used as working registers. Second, the R

registers can be store high-byte data of look-up ROM data. After MOVC instruction executed, the high-byte data of a

ROM address will be stored in R register and the low-byte data stored in ACC.

R initial value = 0000 0000

082H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RBIT7

RBIT6

RBIT5

RBIT4

RBIT3

RBIT2

RBIT1

RBIT0

R/W

Note: Please consult the “LOOK-UP TABLE DESCRIPTION” about R register look-up table application.

PROGRAM FLAG

The PFLAG includes carry flag (C), decimal carry flag (DC) and zero flag (Z). If the result of operating is zero or there is

carry, borrow occurrence, then these flags will be set to PFLAG register.

PFLAG initial value = xxxx x000

086H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PFLAG

R/W

CARRY FLAG

C = 1: If executed arithmetic addition with occurring carry signal or executed arithmetic subtraction without borrowing

signal or executed rotation instruction with shifting out logic “1”.

C = 0: If executed arithmetic addition without occurring carry signal or executed arithmetic subtraction with borrowing

signal or executed rotation instruction with shifting out logic “0”.

DECIMAL CARRY FLAG

DC = 1: If executed arithmetic addition with occurring carry signal from low nibble or executed arithmetic subtraction

without borrow signal from high nibble.

DC = 0: If executed arithmetic addition without occurring carry signal from low nibble or executed arithmetic subtraction

with borrow signal from high nibble.

ZERO FLAG

Z = 1: After operation, the content of ACC is zero.

Z = 0: After operation, the content of ACC is not zero.

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