UPD6600A NEC, UPD6600A Datasheet - Page 15

• Manufacturer Part Number: UPD6600A
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

14. STANDBY FUNCTION (HALT INSTRUCTION)
when not executing the program. Clock oscillation can be stopped in the standby mode (STOP mode).
memory are all retained.
14.1
Therefore, operations requiring the system clock will stop.
will be initiated, after the timer count down operation is completed.
14.2
14.3
Remark
The PD6600A is provided with the standby mode (HALT instruction), in order to reduce the power consumption,
In the standby mode, the program execution stops. However, the contents of the internal registers and the data
In the STOP mode, the operation of the system clock generator (ceramic resonator oscillation circuit) stops.
If the HALT instruction is executed during timer operation, the program counter stops. The oscillation stop mode
The CPU stops its operation, until the HALT release condition is satisfied.
The system clock operation continues in this mode.
(1)
(2)
(3)
(4)
STOP MODE (OSCILLATION STOP HALT INSTRUCTION)
HALT MODE (OSCILLATION CONTINUE HALT INSTRUCTION)
STANDBY RELEASE CONDITIONS
S-IN input
K
K
Timer count down operation completion
0/1
D
I/O
I
0
input
3
input
Releasing condition:
Either high level or low level can be specified for setting a release condition by input.
D
0
0
0
0
2
D
0
0
1
1
1
D
Table 14-1. Standby Mode Releasing Condition
0
1
0
1
0
“0”···Low level detection
“1”···High level detection
Releasing
Condition
Timer
S-IN
K
K
I/O
I
When RL
always released.
Valid only in the IN mode.
Released when 0.
A is selected, the standby mode is
3
Remarks
PD6124A, 6600A
15