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參數(shù)資料
| 型號： | MC80C0216K |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 8位單晶片微控制器 |
| 文件頁數(shù)： | 25/128頁 |
| 文件大?。?/td> | 1408K |
| 代理商： | MC80C0216K |
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Preliminary
MC80F0208/16/24
MAR. 2005 Ver 0.2
21
Figure 8-3 PSW (Program Status Word) Register
[Interrupt disable flag I]
This flag enables/disables all interrupts except interrupt caused
by Reset or software BRK instruction. All interrupts are disabled
when cleared to “0”. This flag immediately becomes “0” when an
interrupt is served. It is set by the EI instruction and cleared by
the DI instruction.
[Half carry flag H]
After operation, this is set when there is a carry from bit 3 of ALU
or there is no borrow from bit 4 of ALU. This bit can not be set
or cleared except CLRV instruction with Overflow flag (V).
[Break flag B]
This flag is set by software BRK instruction to distinguish BRK
from TCALL instruction with the same vector address.
[Direct page flag G]
This flag assigns RAM page for direct addressing mode. In the di-
rect addressing mode, addressing area is from zero page 00
H
to
0FF
H
when this flag is "0". If it is set to "1", addressing area is
assigned 100
H
to 1FF
H
. It is set by SETG instruction and cleared
by CLRG.
[Overflow flag V]
This flag is set to “1” when an overflow occurs as the result of an
arithmetic operation involving signs. An overflow occurs when
the result of an addition or subtraction exceeds +127(7F
H
) or -
128(80
H
). The CLRV instruction clears the overflow flag. There
is no set instruction. When the BIT instruction is executed, bit 6
of memory is copied to this flag.
[Negative flag N]
This flag is set to match the sign bit (bit 7) status of the result of
a data or arithmetic operation. When the BIT instruction is exe-
cuted, bit 7 of memory is copied to this flag.
N
NEGATIVE FLAG
V
G
B
H
I
Z
C
MSB
LSB
RESET VALUE: 00
H
PSW
OVERFLOW FLAG
BRK FLAG
CARRY FLAG RECEIVES
CARRY OUT
ZERO FLAG
INTERRUPT ENABLE FLAG
HALF CARRY FLAG RECEIVES
CARRY OUT FROM BIT 1 OF
ADDITION OPERLANDS
SELECT DIRECT PAGE
when G=1, page is selected to “page 1”
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