7702 datasheet(138/217 Pages) RENESAS

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TIMER B

7702/7703 Group User’s Manual

6–2

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 each other.

7703 Group

Timers B1 and B2s’ function of the 7703 Group varies from the 7702 Group’s. Refer to “Chapter 20. 7703

GROUP.”

6.1 Overview

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

q Timer mode

The timer counts an internally generated count source.

q Event counter mode

The timer counts an external signal.

q Pulse period/pulse width measurement mode

The timer measures an external signal’s pulse period or pulse width.

6.2 Block description

Figure 6.2.1 shows the block diagram of Timer B. Explanation of registers relevant to timer B is described

below.

6.1 Overview 6.2 Block description

Fig. 6.2.1 Block diagram of Timer B

f 2

f 16

f 64

f 512

Count source select bits

Timer mode

Pulse period/Pulse width measurement mode

Polarity switching

and edge pulse

generating circuit

Event counter

mode

Count start bit

Counter reset circuit

Data bus (odd)

Data bus (even)

(Low-order 8 bits)

(High-order 8 bits)

Timer Bi reload register (16)

Timer Bi counter (16)

Timer Bi

interrupt

request bit

TBi IN

Timer Bi

overflow

flag

(Valid in pulse period/pulse width

measurement mode)

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