Renesas M16C/6NK Informações Técnicas descarregar pdf (Página 143)

Rev.2.10 Apr 14, 2006 page 119 of 378

REJ09B0124-0210

M16C/6N Group (M16C/6NK, M16C/6NM) 13. Timers

Item Specification

Count source f1, f2, f8, f32, fC32

Count operation • Down-count

•

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

Divide ratio 1/(n+1) n: set value of the TAi register 0000h to FFFFh

Count start condition Set the TAiS bit in the TABSR register to 1 (count starts)

Count stop condition Set the TAiS bit to 0 (count stops)

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 the TAi register

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

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

• When counting (after 1st count source input)

Value written to the 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 TAiS bit is set to 0 (count stops), the pin outputs a low.

13.1.1 Timer Mode

In timer mode, the timer counts a count source generated internally.

Table 13.1 lists the Timer Mode Specifications. Figure 13.7 shows Registers TA0MR to TA4MR in Timer Mode.

Table 13.1 Timer Mode Specifications

NOTES:

1. The port direction bit for the TAiIN pin is set to 0 (input mode).

2. Selected by the PCLK0 bit in the PCLKR register.

Timer Ai Mode Register (i = 0 to 4)

Symbol

TA0MR to TA4MR

Bit Name FunctionBit Symbol RW

b7 b6 b5 b4 b3 b2 b1 b0

Operating mode

select bits

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 bits

0 0

Gate function not available

0 1 : (TAiIN pin functions as I/O port)

1 0 : Counts while input on the TAiIN pin

is low

(1)

1 1 : Counts while input on the TAiIN pin

is high

(1)

b4 b3

MR2

MR1

MR3

Set to 0 in timer mode

0 0 : f1 or f2

(2)

0 1 : f8

1 0 : f32

1 1 : fC32

b7 b6

TCK1

TCK0

Count source select bits

000

}

Address

0396h to 039Ah

After Reset

00h

i = 0 to 4

Figure 13.7 Registers TA0MR to TA4MR in Timer Mode

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 411 412

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