7702 Datasheet, PDF (138/522 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

TIMER B
6.1 Overview 6.2 Block description
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.
Count source select bits
f2
f 16
f 64
f 512
Timer mode
Pulse period/Pulse width measurement mode
TBi IN
Polarity switching
and edge pulse
generating circuit
Event counter
mode
Fig. 6.2.1 Block diagram of Timer B
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
Count start bit
Counter reset circuit
Timer Bi
overflow
flag
(Valid in pulse period/pulse width
measurement mode)
6–2
7702/7703 Group User’s Manual