Rev. 1.0, 02/00, page 253 of 1141
Section 12 Timer B
12.1
Overview
Timer B is an 8-bit up-counter. Timer B is equipped with two different types of functions namely,
the interval function and the auto reloading function.
12.1.1
Features
•
Seven different types of internal clocks (
φ
/16384,
φ
/4096,
φ
/1024,
φ
/512,
φ
/128,
φ
/32 and
φ
/8)
or an of external clock can be selected.
•
When the counter overflows, a interrupt request will be issued.
12.1.2
Block Diagram
Figure 12.1 shows a block diagram of timer B.
[Legend]
TMB
φ
/16384
φ
/4096
φ
/1024
φ
/512
φ
/128
φ
/32
φ
/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 12.1 Block Diagram of Timer B