W741C260 Datasheet, PDF (55/92 Pages) Winbond – 4-BIT MICROCONTROLLER

W741C260
Instruction Set Table 2, continued
DSKZ R
Decrement R contents 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 contents 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
1
Enable interrupt function
This instruction enables the interrupt function.
Enter the HOLD mode
Machine Code:
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 A3