7220 datasheet(266/303 Pages) RENESAS

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7220 Group User’s Manual

APPENDIX

6.7 Control registers

6-47

Fig. 6.7.25 Timer 34 mode register

Fig. 6.7.26 Interrupt input polarity register

b7 b6 b5 b4 b3 b2 b1 b0

Timer 34 mode register (T34M) [Address 00F516]

After reset RW

Timer 34 Mode Register

6,7

Name

Functions

Timer 3 count source

selection bit (T34M0)

0: f(XIN)/16

1: External clock

Timer 4 internal count

source selection bit

(T34M1)

0: Timer 3 overflow

1: f(XIN)/16

Timer 3 count

stop bit (T34M2)

0: Count start

1: Count stop

Timer 4 count stop

bit (T34M3)

0: Count start

1: Count stop

Nothing is assigned. These bits are write disable

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

“0.”

Timer 4 count source

selection bit (T34M4)

0: Internal clock

1: f(XIN)/2

Timer 3 external count

source selection bit (T34M5)

0: External clock from P2 3/TIM3 pin

1: External clock from H SYNC pin

R—

Address 00F516

Address 00F916

b7 b6 b5 b4 b3 b2 b1 b0

Interrupt input polarity register(RE) [Address 00F9 16]

Name

Functions

After reset

R W

Interrupt Input Polarity Register

INT1 polarity switch bit

(RE3)

1, 2

0 : Positive polarity

1 : Negative polarity

0 : Positive polarity

1 : Negative polarity

0 : Positive polarity

1 : Negative polarity

INT2 polarity switch bit

(RE4)

INT3 polarity switch bit

(RE5)

Nothing is assigned. This bit is a write disable bit.

When this bit is read out, the value is “0.”

Fix these bits to “0.”

Fix this bit to “0.”

Nothing is assigned. This bit is a write disable bit.

When this bit is read out, the value is “0.”

Indeterminate

R—

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