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Chapter 5 Prescaler
V - 12
Operation
Enable the prescaler counting by the PSCEN flag of the prescaler control register (PSCMD). The
prescaler counting is started after it is enabled.
Start the timer operation after the prescaler is set. Also, the selection of the prescaler output should
be set by the timer mode register.
(1) Select the prescaler output to fosc/16 by the
TM0PSC1-0, TM0BAS flag of the timer 0
prescaler selection register (CK0MD).
(2) Enable the prescaler counting by setting the
PSCEN flag of the prescaler control register
(PSCMD) to "1".
Setup Procedure
(1) Select the prescaler output.
CK0MD (x'3F56')
bp2-1 : TM0PSC1-0 = 01
bp0 : TM0BAS = 0
(2) Enable the prescaler output.
PSCMD (x'3F6F')
bp0 : PSCEN = 1
Description
5-3-2 Setup Example
Prescaler Setup Example (Timer 0 count clock)
Select the clock of fosc/16 that is output from the prescaler 0, to the count clock of the timer 0.
An example setup procedure , with a description of each step is shown below.