HMS87C5216 ETC1 [List of Unclassifed Manufacturers], HMS87C5216 Datasheet - Page 19

• Manufacturer Part Number: HMS87C5216
• Description: CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

[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.
SEP. 2004 Ver 1.01
Figure 9-3 PSW (Program Status Word) Register
SELECT DIRECT PAGE FLAG
OVERFLOW FLAG
NEGATIVE FLAG
BRK FLAG
PSW
MSB
N
V
G
B
H
I
Z
[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
128(80
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.
[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 to FF
when this flag is 0. If it is set to 1, addressing area is 1 page. It is
set by instruction and cleared by CLRG.
LSB
C
H
RESET VALUE: 00
). The CLRV instruction clears the overflow flag. There
CARRY FLAG RECEIVES
CARRY OUT
ZERO FLAG
INTERRUPT ENABLE FLAG
HALF CARRY FLAG RECEIVES
CARRY OUT FROM BIT 1 OF
ADDITION OPERLANDS
H
HMS87C5216
H
) or -