7733 datasheet(78/940 Pages) RENESAS

78 / 940 page

7733 Group User’s Manual

3–9

PROGRAMMABLE I/O PORTS

3.3 Pull-up function

Fig. 3.3.1 Structure of port function control register

Bit

Functions

Port function control register (address 6D16)

Bit name

0: Pins P0 to P3 are used for the external bus output.

1: Pins P0 to P3 are used for the port output.

Standby state selection bit

Sub-clock output selection bit/

Timer B2 clock source selection

bit

0: No internal connection

1: Internal connection with timer B2

Timer B1 internal connect

selection bit

Port P6 pull-up selection bit 0

0: No pull-up for pins P54/TA2OUT/KI0 to P57/TA3IN/KI3

1: With pull-up for pins P54/TA2OUT/KI0 to P57/TA3IN/KI3

Port P5 pull-up selection bit

Key input interrupt selection bit

0: INT2 interrupt

1: Key input interrupt

Port P6 pull-up selection bit 1

Must be fixed to “0.”

At reset

•Port-XC selection bitV = “0”

(when the sub clock is not used)

Timer B2 (event counter mode)

clock source selection (Note 1)

0: TB2IN input (event counter mode)

1: Main clock divided by 32

(clock timer)

•Port-XC selection bit = “1”

(when the sub clock is used)

Sub-clock output selection

0: Pin P67/TB2IN/

f SUB functions as a

programmable I/O port.

1: Sub clock

f SUB is output from

pin P67/TB2IN/

f SUB.

(Note 2)

Notes 1: When the port-Xc selection bit = “0” and timer B2 operates in the timer mode or the pulse period

/pulse width measurement mode, bit 1 is in

2: When timer B1 operates in the event counter mode, bit 2 is valid.

represents that bits 0 to 2, 4, and 7 are not used for the pull-up function.

•Key input interrupt selection bit = “0”

0: No pull-up for pin P64/INT2

1: With pull-up for pin P64/INT2

•Key input interrupt selection bit = “1”

0: Pin P64/INT2 is a port with no pull-up.

1: Pin P64/INT2 is an input pin with pull-up

0: No pull-up for pins P62/INT0 and P63/INT1

1: With pull-up for pins P62/INT0 and P63/INT1

Port-Xc selection bitV : Bit 4 of the oscillation circuit control register 0 (address 6C16)

and is used for the key input interrupt.

valid.

7733 Datasheet(PDF) 78 Page - Renesas Technology Corp

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