參數(shù)資料
型號： 16LF628A
廠商： Microchip Technology Inc.
元件分類： 8位微控制器
英文描述： FLASH-Based 8-Bit CMOS Microcontrollers
中文描述： 基于閃存的8位CMOS微控制器
文件頁數(shù)： 48/168頁
文件大小： 3760K
代理商： 16LF628A
PIC16F627A/628A/648A
DS40044A-page 46
Preliminary
2002 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
WDT
TIME OUT
PS0 - PS2
8
PSA
WDT ENABLE BIT
DATA BUS
SET FLAG BIT T0IF
ON OVERFLOW
8
PSA
Note:
T0SE, T0CS, PSA, PS0-PS2 are bits in the Option Register.
T0CS
WDT POSTSCALER/
TMR0 PRESCALER
1
0
1
0
1
0
1
0
TMR1 Clock Source
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