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PIC16F628-20/SS датащи(PDF) 48 Page - Microchip Technology

номер детали PIC16F628-20/SS
подробное описание детали  FLASH-Based 8-Bit CMOS Microcontrollers
PDF  160 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F628-20/SS датащи(HTML) 48 Page - Microchip Technology

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PIC16F62X
DS40300B-page 48
Preliminary
© 1999 Microchip Technology Inc.
6.3
Prescaler
An 8-bit counter is available as a prescaler for the
Timer0 module, or as a postscaler for the Watchdog
Timer, respectively (Figure 6-6). For simplicity, this
counter is being referred to as “prescaler” throughout
this data sheet. Note that there is only one prescaler
available which is mutually exclusive between the
Timer0 module and the Watchdog Timer. Thus, a
prescaler assignment for the Timer0 module means
that there is no prescaler 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 6-6:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
T0CKI
T0SE
pin
M
U
X
CLKOUT (=Fosc/4)
SYNC
2
Cycles
TMR0 reg
8-bit Prescaler
8-to-1MUX
M
U
X
M U X
Watchdog
Timer
PSA
0
1
0
1
WDT
Time-out
PS0 - PS2
8
Note: T0SE, T0CS, PSA, PS0-PS2 are bits in the OPTION register.
PSA
WDT Enable bit
M
U
X
0
1
0
1
Data Bus
Set flag bit T0IF
on Overflow
8
PSA
T0CS



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