Datasheet

Section 11 Timer B1
Rev. 1.50 Sep. 18, 2007 Page 199 of 584
REJ09B0240-0150
Section 11 Timer B1
Timer B1 is an 8-bit timer that increments each time a clock pulse is input. This timer has two
operating modes, interval and auto reload. Figure 11.1 shows a block diagram of timer B1.
11.1 Features
• Selection of seven internal clock sources (φ/8192, φ/2048, φ/512, φ/256, φ/64, φ/16, and φ/4) or
an external clock (can be used to count external events).
• An interrupt is generated when the counter overflows.
[Legend]
TMB1:
φ
TMIB1
TCB1:
Timer mode register B1
Timer counter B1
TLB1:
IRRTB1:
Timer load register B1
Timer B1 interrupt request flag
PSS:
TMIB1:
Prescaler S
Timer B1 event input
Internal data bus
TCB1
TMB1
PSS
TLB1
IRRTB1
Figure 11.1 Block Diagram of Timer B1
11.2 Input/Output Pin
Table 11.1 shows the timer B1 pin configuration.
Table 11.1 Pin Configuration
Name Abbreviation I/O Function
Timer B1 event input TMIB1 Input Event input to TCB1