M32CSLASH86 datasheet(175/505 Pages) RENESAS

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Page 152

15. Timer (Timer A)

)

(

15.1.1 Timer Mode

In timer mode, the timer counts an internally generated count source (see Table 15.3). Figure 15.8

shows the TAiMR register (i=0 to 4) in timer mode.

Table 15.3 Timer Mode Specifications

Item

Specification

Count Source

f1, f8, f2n(1), fC32

Counting Operation

• The timer decrements a counter value

When the timer counter underflows, content of the reload register is reloaded into the

count register and counting resumes.

Divide Ratio

1/(n+1)

n: setting value of the TAi register (i=0 to 4)

000016 to FFFF16

Counter Start Condition

The TAiS bit in the TABSR register is set to "1" (starts counting)

Counter Stop Condition

The TAiS bit is set to "0" (stops counting)

Interrupt Request Generation Timing The timer counter underflows

TAiIN Pin Function

Programmable I/O port or gate input

TAiOUT Pin Function

Programmable I/O port or pulse output

Read from Timer

The TAi register indicates counter value

Write to Timer

• While the timer counter stops, the value written to the TAi register is also written to

both reload register and counter

• While counting, the value written to the TAi register is written to the reload register

(It is transferred to the counter at the next reload timing)

Selectable Function

• Gate function

Input signal to the TAiIN pin determines whether the timer counter starts or stops counting

• Pulse output function

The polarity of the TAiOUT pin is inversed whenever the timer counter underflows

NOTES:

1. The CNT3 to CNT0 bits in the TCSPR register select no division (n=0) or divide-by-2n (n=1 to 15).

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