Datasheet

Section 11 Timer B1
Rev.5.00 Nov. 02, 2005 Page 157 of 500
REJ09B0027-0500
11.4.3 Event Counter Operation
Timer B1 can operate as an event counter in which TMIB1 is set to an event input pin. External
event counting is selected by setting bits TMB12 to TMB10 in TMB1 to 1. TCB1 counts up at
rising or falling edge of an external event signal input at pin TMB1.
When timer B1 is used to count external event input, bit IRQ1 in PMR1 should be set to 1 and
IEN1 in IENR1 should be cleared to 0 to disable IRQ1 interrupt requests.
11.5 Timer B1 Operating Modes
Table 11.2 shows the timer B1 operating modes.
Table 11.2 Timer B1 Operating Modes
Operating Mode Reset Active Sleep Subactive Subsleep Standby
Interval Reset Functions Functions Halted Halted Halted TCB1
Auto-reload Reset Functions Functions Halted Halted Halted
TMB1 Reset Functions Retained Retained Retained Retained