參數(shù)資料
型號(hào)： DMC73C168
英文描述： 8Bit Single Chip Microcontroller
中文描述： 8位單芯片微控制器
文件頁(yè)數(shù)： 26/90頁(yè)
文件大?。?/td> 742K
代理商： DMC73C168
26
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
7
6
5
4
3
2
1
0
BDATA7
BDATA6
BDATA5
BDATA4
BDATA3
BDATA2
BDATA1
BDATA0
Special
-
-
-
-
-
-
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.
￡￡á￡￡×￡￡
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