sh66l16a SinoWealth Micro-Electronics Corp. Ltd, sh66l16a Datasheet - Page 27

• Manufacturer Part Number: sh66l16a
• Description: 16k 4-bit Low Power Micro-controller With Lcd Driver
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

15.2. If the “ Single Solar Supply Application selection” code option is equal to “ Disable ”, the WDT’s time-out period is
Prescaler Divide Ratio: (200kHz RC as the system clock)
Prescaler Divide Ratio: (32.768kHz Crystal as the system clock)
Notes:
If enabled, by the code option, the Watchdog Timer will be cleared when the WDT bit is set in Power-On initial. The WDT bit
is cleared only if the Watchdog Timer time-out occurred both in normal operation mode and in the HALT mode. The Watchdog
Timer is cleared when the device wakes up from the STOP mode, regardless of the source of wake-up.
Status and Condition
Program Notes:
1. If the system clock is changed by the code option, the time-out period of the Watchdog Timer (approx. 20ms) will be changed,
2. The WDT can use a prescaler with a division ratio of up to 1:2048 to prolong the time-out periods by writing to the T0M
regardless of the value of the prescaler divide ratio.
register. Since the T0M register is shared with Timer0, the WDT has the same prescaler value as Timer0. If T0M is changed
for some proper use, the WDT’s time-out period will also be changed.
TM0.2
TM0.2
WDT
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
defined as below.
1
0
0
1
1
TM0.1
TM0.1
Power-On reset
WDT cause reset during normal operation
WDT cause reset in HALT mode
Pin reset during normal operation or in HALT mode
Pin reset or interrupt wake-up in STOP mode
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
TM0.0
TM0.0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Condition
1:1
1:2
1:4
1:8
1:32
1:128
1:512
1:2048 (Power on initial)
1:1
1:2
1:4
1:8
1:32
1:128
1:512
1:2048 (Power on initial)
Prescaler divide ratio
Prescaler divide ratio
27
20.48ms
40.96ms
81.92ms
163.84ms
655.36ms
2,621ms
10,484ms
41,936ms
125ms
250ms
500ms
1s
4s
16s
64s
256s
Timer-out period
Timer-out period
SH66L16A