EM78P157NAKM データシートの表示（PDF） - ELAN Microelectronics

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EM78P157NAKM

8-Bit Microcontroller with OTP ROM

ELAN Microelectronics 

EM78P157N

8-Bit Microcontroller with OTP ROM

4.2.7 Pull-High Control (IOCD) Register

Bit 7

/PH7

Bit 6

/PH6

Bit 5

/PH5

Bit 4

/PH4

Bit 3

/PH3

Bit 2

/PH2

Bit 1

/PH1

Bit 0

/PH0

IOCD Register is both readable and writable

Bit 0 (/PH0): Control bit is used to enable the P60 pin pull-high

0: Enable internal pull-high

1: Disable internal pull-high

Bit 1 (/PH1): Control bit is used to enable the P61 pin pull-high

Bit 2 (/PH2): Control bit is used to enable the P62 pin pull-high

Bit 3 (/PH3): Control bit is used to enable the P63 pin pull-high

Bit 4 (/PH4): Control bit is used to enable the P64 pin pull-high

Bit 5 (/PH5): Control bit is used to enable the P65 pin pull-high

Bit 6 (/PH6): Control bit is used to enable the P66 pin pull-high

Bit 7 (/PH7): Control bit is used to enable the P67 pin pull-high

4.2.8 WDT Control (IOCE) Register

Bit 7

WDTE

Bit 6

EIS

Bit 5

-

Bit 4

ROC

Bit 3

-

Bit 2

-

Bit 1

-

Bit 0

-

Bits 0~3, 5: Not used

Bit 4 (ROC): ROC is used for the R-option

Setting the ROC to "1" will enable the status of R-option pins (P50∼P51)

that are read by the controller. Clearing the ROC will disable the

R-option function. If the R-option function is selected, you must connect

the P51 pin or/and P50 pin to VSS with a 430KΩ external resistor (Rex).

If the Rex is connected or disconnected, the status of P50 (P51) is read

as "0" or "1" respectively Refer to Fig. 4-6 under Section 4.4.

Bit 6 (EIS):

Control bit is used to define the P60 (/INT) pin function

0: P60, bi-directional I/O pin

1: /INT, external interrupt pin. In this case, the I/O control bit of P60

(bit 0 of IOC6) must be set to "1"

EIS is both readable and writable.

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 6 (R6). Refer to Fig.

4-5(a) under Section 4.4.

Bit 7 (WDTE): Control bit is used to enable Watchdog timer

0: Disable WDT

1: Enable WDT

WDTE is both readable and writable

Product Specification (V1.0) 09.22.2005

(This specification is subject to change without further notice)

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