UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 149

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

9.2
Watchdog timer enable
register (WDTE)
The watchdog timer consists of the following hardware.
Remarks 1. f
Configuration of Watchdog Timer
f
RL
f
X
/2
/2
2
4
2. f
Control registers
RL
X
controller
: System clock oscillation frequency
: Low-speed internal oscillation clock oscillation frequency
Clock
input
2
Item
Watchdog timer mode
register (WDTM)
0
Figure 9-1. Block Diagram of Watchdog Timer
counter
Table 9-3. Configuration of Watchdog Timer
16-bit
1
Clear
CHAPTER 9 WATCHDOG TIMER
1
Watchdog timer mode register (WDTM)
Watchdog timer enable register (WDTE)
2
2
or
2
2
Internal bus
11
18
13
20
/f
/f
/f
/f
User’s Manual U16898EJ5V0UD
RL
RL
X
X
WDCS4
to
to
Selector
WDCS3
3
WDCS2
WDCS1 WDCS0
Configuration
controller
Output
Internal reset signal
Option byte
(to set “low-speed
internal oscillator cannot be
stopped” or “low-speed
internal oscillator can be
stopped by software”)
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