PD17225_15 Datasheet, PDF (49/86 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

µPD17225, 17226, 17227, 17228
Table 8-2. Operations After HALT Mode Release (2/2)
(b) HALT 02H
HALT Mode Released by:
8-Bit Timer
Interrupt Status
DI
EI
Interrupt Enable Flag
Disabled
Enabled
Disabled
Enabled
Operations after HALT Mode Release
Instructions are executed from the
instruction next to the HALT instruction.
Branches to interrupt vector address
8.2 HALT Instruction Execution Conditions
The HALT instruction can be executed, only under special conditions, as shown in Table 8-3, to prevent the program
from hangup.
If the conditions in Table 8-3 are not satisfied, the HALT instruction is treated as an NOP instruction.
Table 8-3. HALT Instruction Execution Conditions
Operand Value
0010B (02H)
1000B (08H)
Other Than Above
Execution Conditions
When all interrupt request flags (IRQTM) of 8-bit timer are reset
<1> When interrupt request flag is reset, corresponding to interrupt whose interrupt enable flag
(IPTM, IPBTM, or IP) is set
<2> When high level is input to all P0A0-P0A3 and P0B0-P0B3 pins
Setting prohibited
Data Sheet U12643EJ2V0DS00
47