參數(shù)資料
型號: M306H3FCFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 10 MHz, MICROCONTROLLER, PQFP116
封裝: 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116
文件頁數(shù): 110/135頁
文件大小: 2583K
代理商: M306H3FCFP
Rev.1.00
2004.03.23
page 76 of 320
M306H3MC-XXXFP/FCFP
Watchdog timer start register (Note)
Symbol
Address
After reset
WDTS
000E16
Indeterminate
WO
b7
b0
Function
The watchdog timer is initialized and starts counting after a write instruction to
this register. The watchdog timer value is always initialized to “7FFF16
regardless of whatever value is written.
RW
Note : Write to the WDTS register after the watchdog timer interrupt occurs.
Figure 2.8.2. WDC Register and WDTS Register
CPU
clock
Write to WDTS register
RESET
PM12 = 0
Watchdog timer
Set to
“7FFF16
1/128
1/16
CM07 = 0
WDC7 = 1
CM07 = 0
WDC7 = 0
CM07 = 1
HOLD
1/2
Prescaler
PM12 = 1
Watchdog timer
interrupt request
Reset
PM22 = 0
Figure 2.8.1. Watchdog Timer Block Diagram
Watchdog timer control register
Symbol
Address
After reset
WDC
000F16
00XXXXXX2(Note2)
Function
Bit symbol
RW
b7
b6
b5
b4
b3
b2
b1
b0
High-order bit of watchdog timer
WDC7
Bit name
Prescaler select bit
0 : Divided by 16
1 : Divided by 128
Reserved bit
Must set to “0”
0
RO
RW
Cold start / warm start
discrimination flag (Note 1)
0 : Cold start
1 : Warm start
WDC5
Note 1: The WDC5 bit is always “1” (warm start) no matter how it is set by writing a “0” or “1”.
Note 2: The WDC5 bit is “0” (cold start) immediately after power-on. It can only be set to “1” in a program.
(b4-b0)
(b6)
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