UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 96

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

7.4.3
low-speed internal oscillation clock is being used.
(1) When the watchdog timer operation clock is the system clock (f
96
(2) When the watchdog timer operation clock is the low-speed internal oscillation clock (f
The watchdog timer stops counting during STOP instruction execution regardless of whether the system clock or
When STOP instruction is executed, operation of the watchdog timer is stopped. After STOP mode is released,
operation stops for 34 s (TYP.) and then counting is started again using the operation clock before the operation
was stopped. At this time, the counter is not cleared to 0 but holds its value.
instruction is executed
When the STOP instruction is executed, operation of the watchdog timer is stopped. After STOP mode is
released, operation stops for 34
operation was stopped. At this time, the counter is not cleared to 0 but holds its value.
Figure 7-7. Operation in STOP Mode (WDT Operation Clock: Low-Speed Internal Oscillation Clock)
Note The operation stop time is 17 s (MIN.), 34 s (TYP.), and 67 s (MAX.).
Note The operation stop time is 17 s (MIN.), 34 s (TYP.), and 67 s (MAX.).
Watchdog timer operation in STOP mode (when “low-speed internal oscillator can be stopped by
software” is selected by option byte)
Figure 7-6. Operation in STOP Mode (WDT Operation Clock: Clock to Peripheral Hardware)
Watchdog timer
CPU operation
Watchdog timer
CPU operation
f
CPU
f
CPU
f
RL
Operating
operation
Normal
operation
Operating
Normal
s
(
TYP.
Preliminary User’s Manual U18681EJ1V0UD
CHAPTER 7 WATCHDOG TIMER
STOP
Oscillation stopped
) and then counting is started again using the operation clock before the
Operation stopped
Oscillation stopped
Operation stopped
STOP
stopped
Operation
stopped
Operation
Note
Note
X
) when the STOP instruction is executed
Normal operation
Normal operation
Operating
Operating
RL
) when the STOP