MB89935B 查看數據表（PDF） - Fujitsu

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MB89935B

8-bit Proprietary Microcontroller

Fujitsu 

MB89930A Series

The RP indicates the address of the register bank currently in use. The relationship between the pointer contents

and the actual address is based on the conversion rule illustrated below.

• Rule for Conversion of Actual Addresses of the General-purpose Register Area

Generated addresses

RP

Low OP codes

"0" "0" "0" "0" "0" "0" "0" "1" R4 R3 R2 R1 R0 b2 b1 b0

A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0

The CCR consists of bits indicating the results of arithmetic operations and the contents of transfer data and

bits for control of CPU operations at the time of an interrupt.

H-flag : Set to “1” when a carry or a borrow from bit 3 to bit 4 occurs as a result of an arithmetic operation.

Cleared to “0” otherwise. This flag is for decimal adjustment instructions.

I-flag : Interrupt is enabled when this flag is set to “1”. Interrupt is disabled when the flag is cleared to “0”.

Cleared to “0” at the reset.

IL1, 0 : Indicates the level of the interrupt currently allowed. Processes an interrupt only if its request level is

higher than the value indicated by this bit.

IL1

IL0

0

0

0

1

1

0

1

1

Interrupt level

1

2

3

High-low

High

Low = no interrupt

N-flag :

Z-flag :

V-flag :

C-flag :

Set to “1” if the MSB becomes to “1” as the result of an arithmetic operation. Cleared to “0” when the

bit is cleared to “0”.

Set to “1” when an arithmetic operation results in 0. Cleared otherwise.

Set to “1” if the complement on 2 overflows as a result of an arithmetic operation. Cleared to “0” if the

overflow does not occur.

Set to “1” when a carry or a borrow from bit 7 occurs as a result of an arithmetic operation. Cleared to

“0” otherwise. Set to the shift-out value in the case of a shift instruction.

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