7513 datasheet(26/66 Pages) RENESAS

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

7513 Group

Timer X

Timer X is a 16-bit timer that can be selected in one of four modes

and can be controlled the timer X write and the real time port by

setting the timer X mode register.

(1) Timer Mode

The timer counts f(XIN)/16 (or f(XCIN)/16 in low-speed mode).

(2) Pulse Output Mode

Each time the timer underflows, a signal output from the CNTR0

pin is inverted. Except for this, the operation in pulse output mode

is the same as in timer mode. When using a timer in this mode,

set the port shared with the CNTR0 pin to input.

(3) Event Counter Mode

The timer counts signals input through the CNTR0 pin.

Except for this, the operation in event counter mode is the same

as in timer mode. When using a timer in this mode, set the port

shared with the CNTR0 pin to input.

(4) Pulse Width Measurement Mode

The count source is f(XIN)/16 (or f(XCIN)/16 in low-speed mode). If

CNTR0 active edge switch bit is “0”, the timer counts while the in-

put signal of CNTR0 pin is at “H”. If it is “1”, the timer counts while

the input signal of CNTR0 pin is at “L”. When using a timer in this

mode, set the port shared with tha CNTR0 pin to input.

qTimer X write control

If the timer X write control bit is “0”, when the value is written in the

address of timer X, the value is loaded in the timer X and the latch

at the same time.

If the timer X write control bit is “1”, when the value is written in the

address of timer X, the value is loaded only in the latch. The value

in the latch is loaded in timer X after timer X underflows.

If the value is written in latch only, unexpected value may be set in

the high-order counter when the writing in high-order latch and the

underflow of timer X are performed at the same timing.

sNotes on CNTR0 interrupt active edge selection

CNTR0 interrupt active edge depends on the CNTR0 active edge

switch bit.

qReal time port control

While the real time port function is valid, data for the real time port

are output from ports P52 and P53 each time the timer X

underflows. (However, if the real time port control bit is changed

from “0” to “1”, data are output without the timer X.) When the data

for the real time port is changed while the real time port function is

valid, the changed data are output at the next underflow of timer

Before using this function, set the corresponding port direction

registers to output mode.

Fig. 20 Structure of timer X mode register

Timer X mode register

(TXM : address 002716)

Timer X write control bit

0 : Write value in latch and counter

1 : Write value in latch only

Real time port control bit

0 : Real time port function invalid

1 : Real time port function valid

P52 data for real time port

P53 data for real time port

Timer X operating mode bits

b5 b4

0 : Timer mode

1 : Pulse output mode

0 : Event counter mode

1 : Pulse width measurement mode

CNTR0 active edge switch bit

0 : Count at rising edge in event counter mode

Start from “H” output in pulse output mode

Measure “H” pulse width in pulse width

measurement mode

Falling edge active for CNTR 0 interrupt

1 : Count at falling edge in event counter mode

Start from “L” output in pulse output mode

Measure “L” pulse width in pulse width

measurement mode

Rising edge active for CNTR 0 interrupt

Timer X stop control bit

0 : Count start

1 : Count stop

7513 Datasheet(PDF) 26 Page - Renesas Technology Corp

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