W741E20X Datasheet, PDF (48/84 Pages) Winbond – 4-BIT FLASH MICROCONTROLLER

Preliminary W741E20X
Instruction Set Table 2, continued
DSKZ R
Decrement R content then skip if ACC is zero
Machine Code:
Machine Cycle:
01001000
1
0 R6 R5 R4 R3 R2 R1 R0
Operation:
Description:
Flag Affected:
EN INT
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
Machine Code:
Machine Cycle:
Operation:
Description:
HOLD
Machine Code:
Machine Cycle:
Operation:
Description:
01010000
11000000
1
Enable interrupt function
This instruction enables the interrupt function.
Enter the HOLD mode
00000000
10000000
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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