參數(shù)資料
型號: MC68HCL05J1AP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP20
封裝: PLASTIC, DIP-20
文件頁數(shù): 91/128頁
文件大?。?/td> 1279K
代理商: MC68HCL05J1AP
Parallel Input/Output (I/O)
Port A
MC68HC05J1A — Rev. 3.0
Technical Data
MOTOROLA
Parallel Input/Output (I/O)
65
7.4.4 Port A External Interrupts
If the port A external interrupt mask option is selected, the PA3–PA0 pins
serve as external interrupt pins in addition to the IRQ pin.
External interrupt triggering sensitivity is a mask option. The PA3–PA0
pins can be positive edge-triggered or positive edge- and high
level-triggered.
NOTE:
When testing for external interrupts, the BIH and BIL instructions test the
voltage on the IRQ pin, not the state of the internal IRQ signal.
Therefore, BIH and BIL cannot test the port A external interrupt pins.
Figure 7-4 shows the port A I/O logic.
Figure 7-4. Port A I/O Circuit
PAx
EXTERNAL
INTERRUPT
REQUEST
DATA DIRECTION
REGISTER A
BIT DDRAx
PORT A DATA
REGISTER
BIT PAx
PULLDOWN
REGISTER A
BIT PDIAx
READ $0004
WRITE $0004
WRITE $0000
READ $0000
WRITE $0010
100-
A
PULLDOWN
DEVICE
PULLDOWN DEVICES ENABLED
(MASK OPTION)
RESET
IN
TE
RNA
LD
A
TA
B
U
S
8-mA SINK
CAPABILITY
(PINS PA7–PA4)
(PINS PA3–PA0)
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