HD64F36049 datasheet(196/562 Pages) RENESAS

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Section 11 Timer B1

Rev. 3.00 Mar. 15, 2006 Page 164 of 526

REJ09B0060-0300

11.4.2

Auto-Reload Timer Operation

Setting bit TMB17 in TMB1 to 1 causes timer B1 to function as an 8-bit auto-reload timer. When

a reload value is set in TLB1, the same value is loaded into TCB1, becoming the value from which

TCB1 starts its count. After the count value in TCB1 reaches H'FF, the next clock signal input

causes timer B1 to overflow. The TLB1 value is then loaded into TCB1, and the count continues

from that value. The overflow period can be set within a range from 1 to 256 input clocks,

depending on the TLB1 value.

The clock sources and interrupts in auto-reload mode are the same as in interval mode. In auto-

reload mode (TMB17 = 1), when a new value is set in TLB1, the TLB1 value is also loaded into

TCB1.

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

Halted

TCB1

Auto-reload

Reset

Functions

Halted

TMB1

Reset

Functions

Retained

HD64F36049 Datasheet(PDF) 196 Page - Renesas Technology Corp

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