參數(shù)資料
型號(hào): MC68HC705P6ACDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Microcontroller Unit
中文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 52/130頁
文件大小: 1541K
代理商: MC68HC705P6ACDW
Input/Output Ports
Advance Information
MC68HC705P6A
Rev. 2.0
52
Input/Output Ports
MOTOROLA
6.3 Port A
Port A is an 8-bit bidirectional port, which does not share any of its pins
with other subsystems (see
Figure 6-1
). The port A data register is
located at address $0000 and its data direction register (DDR) is located
at address $0004. The contents of the port A data register are
indeterminate at initial power up and must be initialized by user software.
Reset does not affect the data registers, but does clear the DDRs,
thereby setting all of the port pins to input mode. Writing a 1 to a DDR bit
sets the corresponding port pin to output mode. Port A has mask option
register enabled interrupt capability with an internal pullup device
NOTE:
The keyscan (pullup/interrupt) feature available on port A is NOT
available in the ROM device, MC68HC05P6.
Figure 6-1. Port A I/O and Interrupt Circuitry
READ $0000
WRITE $0000
READ $0004
DATA
REGISTER BIT
I/O
PIN
OUTPUT
INTERNAL HC05
DATA BUS
RESET
(RST)
WRITE $0004
DATA DIRECTION
REGISTER BIT
TO IRQ
INTERRUPT SYSTEM
V
DD
PULLUP MASK
OPTION REGISTER
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