M306H7MG-XXXFP Datasheet, PDF(77/329 Page) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

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M306H7MG-XXXFP Datasheet, PDF (77/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

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M306H7MG-XXXFP/MC-XXXFP/FGFP

9. TIMERS

9.1.1 Timer Mode

In timer mode, the timer counts a count source generated internally (see Table 9.1). Figure 9.7 shows TAiMR

register in timer mode.

Table 9.1 Specifications in Timer Mode

Item

Count source

Count operation

Specification

f1, f2, f8, f32, fC32

â¢ Down-count

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

Divide ratio

Count start condition

1/(n+1) n: set value of TAi register (i= 0 to 4) 000016 to FFFF16

Set TAiS bit of TABSR register to â1â (= start counting)

Count stop condition

Set TAiS bit to â0â (= stop counting)

Interrupt request generation timing Timer underflow

TAiIN pin function

TAiOUT pin function

Read from timer

Write to timer

I/O port or gate input

I/O port or pulse output

Count value can be read by reading TAi register

â¢ 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

â¢ 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

â¢ Gate function

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

â¢ Pulse output function

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

When not counting, the pin outputs a low.

Timer Ai mode register (i=0 to 4)

b7 b6 b5 b4 b3 b2 b1 b0

0

00

Symbol

TA0MR to TA4MR

Address

039616 to 039A16

After reset

0016

Bit symbol

TMOD0

TMOD1

MR0

Bit name

Operation mode

select bit

Pulse output function

select bit

MR1

Gate function select bit

MR2

Function

RW

b1 b0

RW

0 0 : Timer mode

RW

0 : Pulse is not output

(TAiOUT pin is a normal port pin)

1 : Pulse is output (Note 1)

RW

(TAiOUT pin is a pulse output pin)

b4 b3

00:

01:

Gate function not available

(TAiIN pin functions as I/O port)

RW

1 0 : Counts while input on the TAiIN pin

is low (Note 2)

1 1 : Counts while input on the TAiIN pin RW

is high (Note 2)

MR3

Must be set to â0â in timer mode

RW

TCK0

Count source select bit

b7 b6

0 0 : f1 or f2

RW

0 1 : f8

TCK1

1 0 : f32

RW

1 1 : fC32

Note 1: TA0OUT pin is N-channel open drain output.

Note 2: The port direction bit for the TAiIN pin must be set to â0â (= input mode).

Figure 9.7 Timer Ai Mode Register in Timer Mode

Rev.2.10 Oct 25, 2006 Page 77 of 326

REJ03B0152-0210

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