7630 datasheet(42/238 Pages) RENESAS

42 / 238 page

1-26

7630 Group User’s Manual

+$5':$5(

TIMER 1, TIMER 2, TIMER 3

Timers 1 to 3 are 8-bit timers with 8-bit reload latches and one com-

mon pre-divider. Timer 1 can operate in the timer mode only, whereas

timers 2 and 3 can be used to generate a PWM output signal timing

as well. Timers 1 to 3 are down count timers. See Fig. 23.

Fig. 23 Block diagram of timers 1 to 3 (

φ is internal system clock)

Timer 1

The count source of timer 1 is the output of timer 123 pre-divider. The

division ratio of the pre-divider can be selected by the pre-divider divi-

sion ratio bits of timer 123 mode register (T123M). Refer to Timer 123

mode register configuration (f is internal system clock).

On a timer 1 underflow, the timer 1 interrupt request bit will be set to

“1”.

Writing to timer 1 initializes the latch and counter.

Timers 2 and 3

The count source of timers 2 and 3 can be either the output of the

timer 123 pre-divider or the timer 1 underflow. The count source can

be selected by the timer count source selection bits of timer 123

mode register (T123M).

Writing to timer 2 register affects the reload latch only or both of the

reload latch and counter depending on the timer 2 write control bit of

T123M. When the timer write control bit is set to “0”, both latch and

counter will be initialized simultaneously; when set to “1” only the

reload latch will be initialized, on an underflow, the counter will be set

to the modified reload value. Writing to timer 3 initializes latch and

counter both.

Timer 2 or 3 underflow causes the timer 2 or 3 interrupt request bit to

be set to “1”.

T123M0

1/8

1/32

1/128

T123M67

T1 counter (8)

T1 latch (8)

T2 counter (8)

T2 latch (8)

T3 counter (8)

T3 latch (8)

T1 interrupt

T2 interrupt

T3 interrupt

T123M3

T123M4

T123M1

P16/PWM

P16 latch

P1D6

T123M1

“00

”

“01”

“10”

“11”

“1”

“0”

“1”

“0”

“1”

TIMERS

7630 Datasheet(PDF) 42 Page - Renesas Technology Corp

7630 Datasheet(HTML) 42 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