R8CSLASH15 datasheet(96/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

13. Timers

Rev.2.10

Jan 19, 2006

Page 84 of 253

REJ09B0164-0210

13.1

Timer X

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

The prescaler and timer consist of the reload register and counter. The reload register and counter are

allocated at the same address. When accessing the PREX and TX registers, the reload register and

counter can be accessed (Refer to Tables 13.2 to 13.6 the Specification of Each Modes).

Figure 13.1 shows the Block Diagram of Timer X. Figures 13.2 and 13.3 show the registers associated

with Timer X.

Timer X contains five operating modes listed as follows:

• Timer mode:

The timer counts an internal count source.

• Pulse output mode:

The timer counts an internal count source and outputs the

pulses which inverts the polarity by underflow of the timer.

• Event counter mode:

The timer counts external pulses.

• Pulse width measurement mode:

The timer measures the pulse width of an external pulse

• Pulse period measurement mode: The timer measures the pulse period of an external pulse.

Figure 13.1

Block Diagram of Timer X

=00b

=01b

=11b

=10b

fRING

TXCK1 to TXCK0

TXMOD1 to TXMOD0

=00b or 01b

=11b

=10b

TXS bit

Counter

Reload register

PREX register

Counter

Reload register

TX register

Data bus

Timer X interrupt

INT1 interrupt

Write to TX register

TXMOD1 to TXMOD0 bits=01b

TXMOD0 to TXMOD1, R0EDG, TXS, TXOCNT : Bits in TXMR register

TXCK0 to TXCK1 : Bits in TCSS register

CNTRSEL : Bit in UCON register

Toggle flip-flop

CLR

R0EDG=1

R0EDG=0

Polarity

switching

TXOCNT bit

CNTR0

TXMOD1 to TXMOD0

bits=01b

INT11/CNTR01

INT10/CNTR00

CNTRSEL=1

CNTRSEL=0

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