M16CSLASH29 datasheet(130/499 Pages) RENESAS

130 / 499 page

12. Timer A

page 106

Item

Specification

Count source

f1, f2, f8, f32, fC32

Count operation

• Decrement

• When the timer underflows, it reloads the reload register contents and continues counting

Divide ratio

1/(n+1)

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

000016 to FFFF16

Count start condition

Set TAiS bit in the TABSR register to 1 (start counting)

Count stop condition

Set TAiS bit to 0 (stop counting)

Interrupt request generation timing Timer underflow

TAiIN pin function

I/O port or gate input

TAiOUT pin function

I/O port or pulse output

Read from timer

Count value can be read by reading TAi register

Write to timer

• When not counting and until the 1st count source is input after counting start

Value written to TAi register is written to both reload register and counter

• When counting (after 1st count source input)

Value written to TAi register is written to only reload register

(Transferred to counter when reloaded next)

Select function

• Gate function

Counting can be started and stopped by an input signal to TAiIN pin

• Pulse output function

Whenever the timer underflows, the output polarity of TAiOUT pin is inverted.

When not counting, the pin outputs a low.

12.1.1 Timer Mode

In timer mode, the timer counts a count source generated internally (see Table 12.1). Figure 12.7 shows

TAiMR register in timer mode.

Table 12.1 Specifications in Timer Mode

Figure 12.7 Timer Ai Mode Register in Timer Mode

NOTE:

1. The port direction bit for the TAi IN pin must be set to 0 ( input mode).

Timer Ai Mode Register (i=0 to 4)

Symbol

Address

After Reset

TA0MR to TA4MR

039616 to 039A16

0016

Bit Name

Function

Bit Symbol

b7 b6 b5 b4 b3 b2 b1 b0

Operation mode

select bit

0 0: Timer mode

b1 b0

TMOD1

TMOD0

MR0

Pulse output function

select bit

0: Pulse is not output

(TAiOUT pin is a normal port pin)

1: Pulse is output

(TAiOUT pin is a pulse output pin)

Gate function select bit

0 0:

Gate function not available

0 1:

(TAiIN pin functions as I/O port)

1 0: Counts while input on the TAi IN pin

is low (1)

1 1: Counts while input on the TAi IN pin

is high(1)

b4 b3

MR2

MR1

MR3

Set to 0 in timer mode

0 0: f1 or f2

0 1: f8

1 0: f32

1 1: fC32

b7 b6

TCK1

TCK0

Count source select bit

}

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