W741L250 Datasheet, PDF (51/86 Pages) Winbond – 4-BIT MICROCONTROLLER

W741L250
Instruction Set Table 2, continued
DSKZ R
Decrement R content then skip if ACC is zero
Machine Code:
Machine Cycle:
Operation:
Description:
Flag Affected:
EN INT
Machine Code:
01001000
0 R6 R5 R4 R3 R2 R1 R0
1
ACC, R ← (R) - 1;
PC ← (PC) + 2 if ACC = 0
Decrement the data memory content and load result into the ACC and the
data memory. If ACC = 0, the program counter is incremented by 2 and
produces a skip.
CF & ZF
Enable interrupt function
01010000
11000000
Machine Cycle:
Operation:
Description:
HOLD
Machine Code:
1
Enable interrupt function
This instruction enables the interrupt function.
Enter the HOLD mode
00000000
10000000
Machine Cycle:
Operation:
Description:
1
Enter the HOLD mode
The following two conditions cause the HOLD mode to be released.
(1) An interrupt is accepted.
(2) The HOLD release condition specified by the HEF is met.
In HOLD mode, when an interrupt is accepted the HOLD mode will be
released and the interrupt service routine will be executed. After
completing the interrupt service routine by executing the RTN instruction,
the µC will enter HOLD mode again.
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Publication Release Date: March 1998
Revision A2