PIC16C432-I View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C432-I

OTP 8-Bit CMOS MCU with LIN Transceiver

Microchip Technology 

PIC16C432

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 PS<2:0> bits (OPTION<3:0>) determine

the prescaler assignment and prescale ratio.

When assigned to the Timer0 module, all instructions

writing to the TMR0 register (i.e., CLRF 1, MOVWF 1,

BSF 1,x....etc.) will clear the prescaler. 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

CLKOUT (= FOSC/4)

Data Bus

T0CKI

pin

T0SE

0M

U

X

1

T0CS

1

M

0

U

X

PSA

SYNC

2

Cycles

8

TMR0 reg

Set Flag bit T0IF

on Overflow

Watchdog

Timer

WDT Enable bit

0

M

U

1X

PSA

8-bit Prescaler

8

8-to-1MUX

PS<2:0>

0

1

MUX

PSA

WDT

Timeout

Note 1: T0SE, T0CS, PSA, PS<2:0> are bits in the OPTION register.

DS41140C-page 30

Preliminary

 2000-2013 Microchip Technology Inc.

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