7220 datasheet(63/303 Pages) RENESAS

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2-36

7220 Group User’s Manual

FUNCTIONAL DESCRIPTION

2.6 Timers

b7 b6 b5 b4 b3 b2 b1 b0

Timer 12 mode register (T12M) [Address 00F416]

After reset

Timer 12 Mode Register

Name

Functions

Timer 1 count source

selection bit (T12M0)

0: f(XIN)/16

1: f(XIN)/4096

Timer 2 count source

selection bit

(T12M1)

0: Internal clock

1: External clock from

P24/TIM2 pin

Timer 1 count

stop bit (T12M2)

0: Count start

1: Count stop

Timer 2 count stop

bit (T12M3)

0: Count start

1: Count stop

Timer 2 internal count

source selection bit

(T12M4)

0: f(XIN)/16

1: Timer 1 overflow

Fix this bit to “0.”

6,7

Nothing is assigned. These bits are write disable

bits. When these bits are read out, the values are

“0.”

—

Fig. 2.6.3 Timer 12 mode register (address 00F416)

(3)

Timer 3

Timer 3 can select one of the following count sources:

q f(XIN)/16

q External clock from pin HSYNC

q External clock from pin P23/TIM3

The count source of timer 3 is selected by setting bits 5 and 0 of the timer 34 mode register (address

00F516)

Timer 3 interrupt request occurs at timer 3 overflow.

(4)

Timer 4

Timer 4 can select one of the following count sources:

q f(XIN)/16

q f(XIN)/2

q Timer 3 overflow signal

The count source of timer 3 is selected by setting bits 4 and 1 of the timer 34 mode register (address

00F516). When timer 3 overflow signal is a count source for timer 4, timer 3 functions as an 8-bit

prescaler.

Timer 4 interrupt request occurs at timer 4 overflow.

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