参数资料
型号: MC68HC705K1CDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDSO16
封装: SOIC-16
文件页数: 102/140页
文件大小: 3196K
代理商: MC68HC705K1CDW
Technical Data
MC68HC705K1 — Rev. 2.0
Parallel Input/Output (I/O)
7.3 I/O Port Function
The 10 bidirectional input/output (I/O) pins form two parallel I/O ports.
Each I/O pin is programmable as an input or an output. The contents of
the data direction registers determine the data direction of each I/O pin.
All 10 I/O pins have software-programmable pulldown devices.
7.4 Port A
Port A is an 8-bit, general-purpose, bidirectional I/O port with these
features:
Programmable pulldown devices
8-mA current sinking capability (pins PA7–PA4)
External interrupt capability (pins PA3–PA0)
7.4.1 Port A Data Register
The port A data register (PORTA) contains a bit for each of the port A
pins. When a port A pin is programmed to be an output, the state of its
data register bit determines the state of the output pin. When a port A pin
is programmed to be an input, reading the port A data register returns
the logic state of the pin.
PA7–PA0 — Port A Data Bits
These read/write bits are software-programmable. Data direction of
each bit is under the control of the corresponding bit in data direction
register A. Reset has no effect on port A data.
Address:
$0000
Bit 7
654321
Bit 0
Read:
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Write:
Reset:
Unaffected by reset
Figure 7-1. Port A Data Register (PORTA)
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For More Information On This Product,
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