參數(shù)資料
型號: HCS405
廠商: Microchip Technology Inc.
英文描述: Code Hopping Encoder(KeeLoq 碼編碼器)
中文描述: 跳碼編碼器(而Keeloq碼編碼器)
文件頁數(shù): 46/170頁
文件大小: 4191K
代理商: HCS405
PIC16F62X
DS40300C-page 44
Preliminary
2003 Microchip Technology Inc.
6.3
Timer0 Prescaler
An 8-bit counter is available as a prescaler for the
Timer0 module, or as a postscaler for the Watchdog
Timer. A prescaler assignment for the Timer0 module
means that there is no postscaler for the Watchdog
Timer, and vice-versa.
The PSA and PS2:PS0 bits (OPTION<3:0>) determine
the prescaler assignment and prescale ratio.
When assigned to the Timer0 module, all instructions
writing to the TMR0 register (e.g.,
CLRF 1,
MOVWF 1, BSF 1, x....etc.
) will clear the pres-
caler. When assigned to WDT, a
CLRWDT
instruction
will clear the prescaler along with the Watchdog Timer.
The prescaler is not readable or writable.
FIGURE 6-1:
BLOCK DIAGRAM OF THE TIMER0/WDT
T0CKI
Pin
T0SE
F
OSC
/4
SYNC
2
Cycles
TMR0 reg
8-to-1MUX
Watchdog
Timer
PSA
0
1
0
1
WDT
Timeout
PS0 - PS2
8
PSA
WDT Enable bit
0
1
0
1
Data Bus
Set Flag Bit T0IF
on Overflow
8
PSA
Note
1:
T0SE, T0CS, PSA,.
T0CS
WDT Postscaler/
TMR0 Prescaler
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