參數(shù)資料
型號: MC68HC05P18ACP
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 83/130頁
文件大?。?/td> 1310K
代理商: MC68HC05P18ACP
NON-DISCLOSURE
AGREEMENT
REQUIRED
Input/Output (I/O) Ports
Technical Data
MC68HC05P18A
Input/Output (I/O) Ports
7.3 Port A
Port A is an 8-bit bidirectional port which can share its pins with the IRQ
interrupt system, as shown in Figure 7-1. Each port A pin is controlled
by the corresponding bits in a data direction register and a data register.
The port a data register is located at address $0000. The port A data
direction register (DDRA) is located at address $0004. Reset clears the
DDRA thereby initializing port A as an input port. The port A data register
is unaffected by reset.
Figure 7-1. Port A I/O Circuitry
100
A
PULLUP
READ $0000
WRITE $0000
READ $0004
DATA
REGISTER BIT
TO IRQ
INTERRUPT
SYSTEM
I/O
PIN
OUTPUT
MASK OPTION
(PULLUP INHIBIT)
INTERNAL HC05
DATA BUS
RESET
(RST)
WRITE $0004
DATA DIRECTION
REGISTER BIT
VDD
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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