|
Z87233 Datasheet, PDF (46/71 Pages) Zilog, Inc. – CMOS Z8-R MCU Consumer Controller Processor | |||
|
◁ |
Z87233
CMOS Z8â MCU Consumer Controller Processor
40
Bit
Bit
Position Field
Reset
R/W State Description
D7
MIE
R/W
0 Master Interrupt Enable
1: Enable interrupts
0: Disable interrupts
D6
RAM Protect R/W
X RAM Protect
1: Enable RAM Protect*
0: Disable RAM Protect
D5âD0 IRQ5âIRQ0 R/W
X Interrupt Request
1: Enable IRQ0âIRQ5
0: Disable IRQ0âIRQ5
Note: * Must select RAM Protect Mask Option
Flags Register
The CPU sets flags in the Flags Register, FLAGS, to allow the user to perform
tests based on differing logical states. READ/WRITE and reset states for bits D7â
D0 are listed in Table 27.
Table 27. Flags RegisterâFLAGS FCh/R252 Bank 0h: READ/WRITE
Bit
D7 D6 D5
R/W
R/W R/W R/W
Reset
X
X
X
Note: R = Read, W = Write, X = Indeterminate.
D4
R/W
X
D3
R/W
X
D2
D1
D0
R/W R/W R/W
X
X
X
Bit
Bit
Position Field
D7
Carry
D6
Zero
D5
Sign
D4
Overflow
D3
Decimal Adjust
D2
Half Carry
D1
User
D0
User
Note: *Not affected by RESET.
Reset
R/W State Description
R/W
X Carry Flag
R/W
X Zero Flag
R/W
X Sign Flag
R/W
X Overflow Flag
R/W
X Decimal Adjust Flag
R/W
X Half Carry Flag
R/W
X User Flag F2*
R/W
X User Flag F1*
PS022701-0104
|
▷ |