M16CSLASH1N datasheet(85/238 Pages) RENESAS

85 / 238 page

Rev.1.00

Oct 20, 2004

page 73 of 222

M16C/1N Group

12. Timers

REJ09B0007-0100Z

Clock source

selection

Timer

Pulse period

measurement

Pulse output

f32

Event counter

fC32

Toggle flip-flop

Polarity

switching

CNTR0

interrupt

request bit

P30/TXOUT select bit

TXOUT

CNTR0 polarity

switching bit

"1"

"0"

Pulse width

measurement

Pulse output

Counter (8)

Reload register (8)

Counter (8)

Reload register (8)

Timer X count

start flag

Prescaler X (address 008C16)

Timer X (address 008D16)

Pulse output mode

Timer X latch write

Timer X interrupt

request bit

Peripheral data bus

fPX

Note 1: In the pulse output mode, the direction register of port P17 should be set to input.

Note 2: This bit should rewrite with inhibiting the CNTR0 interrupt. To use all interrupt, enable an interrupt after the CNTR0

interrupt request bit is cleared with the MOV instruction.

Note 3: Nothing is assigned to the pod probe for M16C/1N group (M301N2T-PRB).

Timer X mode register

TXMOD0

TXMOD1

Operation mode

select bit 0, 1

(Note 2)

R0EDG

CNTR0 polarity

switching bit (Note 2)

TXS

Timer X count

start flag

0 : Stops counting

1 : Starts counting

0 : Rising edge

1 : Falling edge

TXOCNT

P30/TXOUT

select bit

Function varies with each operation mode

TXMOD2

Operation mode

select bit 2

0 : Except in pulse period measurement mode

1 : Pulse period measurement mode

TXEDG

Effectual edge

reception flag (Note 3)

Function varies with each operation mode

TXUND

Timer X under flow

flag (Note 3)

Function varies with each operation mode

Symbol

TXMR

Address

008B16

When reset

0016

Function

Bit name

Bit symbol

b1 b0

0 0 : Timer mode or

pulse period measurement mode

0 1 : Pulse output mode (Note 1)

1 0 : Event counter mode

1 1 : Pulse width measurement mode

12.2 Timer X

Timer X is an 8-bit timer with an 8-bit prescaler.

Timer X has the five operation modes listed as follows:

• Timer mode:

The timer counts an internal count source (clock source).

• Pulse output mode:

The timer counts an internal count source and outputs the pulses

whose polarity is inverted at the timer the timer underflows.

• Event counter mode:

The timer counts pulses from an external source.

• Pulse width measurement mode: The timer measures an external pulse's pulse width.

• Pulse period measurement mode: The timer measures an external pulse's period.

Figure 12.3 shows the block diagram of Timer X. Figures 12.4 and 12.5 shows the Timer X-related

registers.

Figure 12.3 Block diagram of Timer X

Figure 12.4 Timer X-related registers (1)

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