HD6433644R datasheet(234/549 Pages) RENESAS

234 / 549 page

Section 9 Timers

Rev. 6.00 Sep 12, 2006 page 214 of 526

REJ09B0326-0600

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 set in

TCB1.

Event Counter Operation: Timer B1 can operate as an event counter, counting rising or falling

edges of an external event signal input at pin TMIB. External event counting is selected by setting

bits TMB12 to TMB10 in timer mode register B1 (TMB1) to all 1s (111).

When timer B1 is used to count external event input, bit INTEN6 in IENR3 should be cleared to 0

to disable INT6 interrupt requests.

9.3.4

Timer B1 Operation States

Table 9.7 summarizes the timer B1 operation states.

Table 9.7

Timer B1 Operation States

Operation Mode

Reset

Active

Sleep

Watch

Sub-

active

Sub-

sleep

Standby

TCB1 Interval

Reset

Functions

Halted

Auto reload Reset

Functions

Halted

TMB1

Reset

Functions

Retained

Retained Retained Retained

HD6433644R Datasheet(PDF) 234 Page - Renesas Technology Corp

HD6433644R Datasheet(HTML) 234 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL