參數(shù)資料
型號: MC68HC05J1AVDW
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: RESISTOR SILICONE 1.5 OHM 5W
中文描述: 微控制器
文件頁數(shù): 65/128頁
文件大?。?/td> 1620K
代理商: MC68HC05J1AVDW
Parallel Input/Output (I/O)
Port A
MC68HC05J1A — Rev. 3.0
Technical Data
MOTOROLA
Parallel Input/Output (I/O)
For More Information On This Product,
Go to: www.freescale.com
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
(PINS PA3
PA0)
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-
μ
A
PULLDOWN
DEVICE
PULLDOWN DEVICES ENABLED
(MASK OPTION)
RESET
I
8-mA SINK
CAPABILITY
(PINS PA7
PA4)
F
Freescale Semiconductor, Inc.
n
.
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