DMC73CE167 查看數據表（PDF） - Daewoo Semiconductor

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DMC73CE167

8Bit Single Chip Microcontroller

Daewoo Semiconductor 

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8Bit Single Chip Microcontroller

DMC73C167

INT5_0 : External interrupt 5_0 is triggered by the falling and rising transition of

Pin A5, which must be the input mode to be used as an interrupt source.

This pin can also be used as a normal input port while the interrupt is

activated.

5.1.2 B Port

Pins B0 to B7 of B Port are output only pins. Pins B0 to B3 contain a high-voltage buffer (12V

nominal) with open-drain output and Pins B4 to B7 contain a high-current output buffer (12mA

nominal). Pins B0 and B1 can be used as the clock output of Timer 1 and Timer 3,

respectively. in the DMC73C167, the user can specify the internal pull-up (5V) resistor

for the B4 to B7 ports selectively (mask option).

Table 5-4. P8 0108h BDATA B Port Data

Bit

R

W

Special

7

6

5

4

3

2

1

0

BDATA7 BDATA6 BDATA5 BDATA4 BDATA3 BDATA2 BDATA1 BDATA0

-

-

-

-

-

-

T3OUT T1OUT

The B Port control register operation is as follows.

WRITE : Setting the BDATAn bit to 1 outputs logic high status to the same pin

number and setting BDATAn bit to 0 outputs logic low status to the

same pin number.

READ : External pins are not accessed through the read operation. The CPU

can read data from B Port but it is the contents of the output buffer

register written by the CPU previously.

Note : Special usage for Pins B0 and B1 is as follows.

T1OUT : Clock output for Timer 1

Underflow of Timer 1 MSB decrement register toggles the logic level of Pin B0

When bit 6 of T1CTL0 (P22) is set to 1.

T3OUT : Clock output for Timer 3

Underflow of Timer 3 decrement register toggles the logic level of Pin B1 when

bit 6 of T2CTL (P25) is set to 1.

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