UPD17230 Datasheet, PDF (58/92 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

µPD17230, 17231, 17232, 17233, 17234, 17235, 17236
8.4 STOP Instruction Execution Conditions
The STOP instruction can be executed, only under special conditions, as shown in Table 8-5, to prevent the program
from hang-up.
If the conditions in Table 8-5 are not satisfied, the STOP instruction is treated as an NOP instruction.
Table 8-5. STOP Instruction Execution Conditions
Operand Value
1000B (08H)
Other than above
Execution Conditions
<1> High level input for all P0A0-P0A3 pins
<2> When P0B0-P0B3, P0C0-P0C3, and P0D0-P0D3 are used as input pins and all pins are high
<3> If the INT pin interrupt request flag (IRQ) for an interrupt for which the INT pin interrupt
enable flag (IP) is set is reset
Setting prohibited
8.5 Releasing Standby Mode
Operations for releasing the STOP and HALT modes will be as shown in Figure 8-1.
Figure 8-1. Operations After Standby Mode Release
(a) Releasing STOP mode by interrupt
Stanby
release signal
STOP
instruction
Operation
mode
STOP mode
Wait
(time set by TMM)
HALT mode
Oscillation
Clock
Oscillation stops
Oscillation
Operation
mode
(b) Releasing HALT mode by interrupt
HALT
instruction
Stanby
release signal
Operation
mode
HALT mode
Operation
mode
Clock
Oscillation
Remark The dotted line indicates the operation to be performed when the interrupt request, releasing the standby
mode, has been accepted.
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Data Sheet U14360EJ1V0DS00