7906 datasheet(153/531 Pages) RENESAS

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7906 Group User’s Manual Rev.2.0

8-2

TIMER B

8.1 Overview, 8.2 Block description

8.1 Overview

Timer B consists of three counters (timers B0 to B2) each equipped with a 16-bit reload function. Timers

B0 to B2 have identical functions and operate independently of one other.

Timer Bi (i = 0 to 2) has three operating modes listed below.

(1)

Timer mode

The timer counts an internally generated count source.

(2)

Event counter mode

The timer counts an external signal.

(3)

Pulse period/Pulse width measurement mode

The timer measures an external signal’s pulse period or pulse width. In this mode, the following count

types are available:

• Count clear type

• Free-run type

8.2 Block description

Figure 8.2.1 shows the block diagram of timer B. Explanation of registers relevant to timer B is described

below.

Fig. 8.2.1 Block diagram of timer B

f16

f64

f512

Count source select bits

•Timer

•Pulse period measurement/pulse

width measurement

Event counter

mode

Count start register

Counter reset circuit

Data bus (odd)

Data bus (even)

(Low-order 8 bits)

(High-order 8 bits)

Timer Bi reload register (16)

Timer Bi

interrupt

request bit

TBiIN

Timer Bi

overflow

flag

(Valid in the pulse period/pulse width

measurement mode.)

Timer Bi counter (16)

Polarity selection

and edge pulse

generator

Timer B2 clock source

select bit (Note)

Timer B2 clock source select bit : Bit 6 at address 6316

Note: Only for timer B2, a clock source in the event counter mode can be selected.

fX32

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