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Rev. 2.0, 11/00, page 295 of 1037
Section 13 Timer B
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.
[Legend]
TMB
/16384
/4096
/1024
/512
/128
/32
/8
TMBI
TCB
: Timer mode register B
: Timer counter B
TLB
TMBI
: Timer re-loading register B
: Event input terminal of the Timer B
Re-loading
Clock sources
Overflowing
Timer B
Interrupt requests
Internal data bus
TCB
TMB
TLB
Interrupting
circuit
Figure 13.1 Block diagram of the Timer B
Содержание Hitachi H8S/2191
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