Section 13 Timer B; Overview; Features; Block Diagram - Renesas Hitachi H8S/2194 Series Hardware Manual

13.1

Overview

The Timer B is an 8-bit up-counter. The Timer B is equipped with two different types of
functions namely, the interval function and the auto reloading function.
13.1.1

Features

• Selection from choices of seven different types of internal clocks (φ/16384, φ/4096, φ/1024,
φ/512, φ/128, φ/32 and φ/8) or selection of external clock are possible.
• When the counter overflows, a interrupt request will be issued.
13.1.2

Block Diagram

Figure 13.1 shows a block diagram of the Timer B.
Clock sources
/16384
/4096
/1024
/512
/128
/32
/8
TMBI
[Legend]
TMB : Timer mode register B
TCB : Timer counter B
TLB : Timer re-loading register B
TMBI : Event input terminal of the Timer B

Section 13 Timer B

Figure 13.1 Block diagram of the Timer B
TMB
TCB
Overflowing
Re-loading
TLB
Interrupting
circuit
Rev. 2.0, 11/00, page 295 of 1037
Timer B
Interrupt requests