EM78458AM datasheet(21/62 Pages) EMC

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EM78458/459

8-Bit Microcontroller with MASK ROM

Product Specification (V1.4) 05.27.2005

• 15

(This specification is subject to change without further notice)

4.2.8 IOCD0 (Pull-high Control Register)

/PH7

/PH6

/PH5

/PH3

/PH2

/PH1

/PH0

Bit 0 (/PH0)

Control bit is used to enable the pull-high of the P60 pin.

0: Enable internal pull-high;

1: Disable internal pull-high.

Bit 1 (/PH1)

Control bit is used to enable the pull-high of the P61 pin.

Bit 2 (/PH2)

Control bit is used to enable the pull-high of the P62 pin.

Bit 3 (/PH3)

Control bit is used to enable the pull-high of the P63 pin.

Bit 4

Not used.

Bit 5 (/PH5)

Control bit is used to enable the pull-high of the P53 pin.

Bit 6 (/PH6)

Control bit is used to enable the pull-high of the P55 pin.

Bit 7 (/PH7)

Control bit is used to enable the pull-high of the P56 pin.

IOCD0 register is both readable and writable.

4.2.9 IOCE0 (WDT Control Register)

WDTE

EIS

Bit 7 (WDTE)

Control bit is used to enable Watchdog Timer.

0: Disable WDT;

1: Enable WDT.

WDTE is both readable and writable

Bit 6 (EIS)

Control bit is used to define the function of the P50 (/INT) pin.

0: P50, input pin only;

1: /INT, external interrupt pin. In this case, the I/O control bit of P50 (bit 0

of IOC50) must be set to "1".

When EIS is "0", the path of /INT is masked. When EIS is "1", the status

of /INT pin can also be read by way of reading Port 5 (R5). Refer to Fig.

EIS is both readable and writable.

Bits 0~5

Not used.

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