参数资料
型号: MC68HC08QY4CDWE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封装: 1.27 MM PITCH, LEAD FREE, PLASTIC, MS-013AA, SOIC-16
文件页数: 177/178页
文件大小: 2311K
代理商: MC68HC08QY4CDWE
Input/Output Ports (PORTS)
MC68HC08QY/QT Family Data Sheet, Rev. 1
98
Freescale Semiconductor
12.3.1 Port A Data Register
The port A data register (PTA) contains a data latch for each of the six port A pins.
PTA[5:0] — Port A Data Bits
These read/write bits are software programmable. Data direction of each port A pin is under the control
of the corresponding bit in data direction register A. Reset has no effect on port A data.
AWUL — Auto Wakeup Latch Data Bit
port nor any of the associated bits such as PTA6 data register, pullup enable or direction.
12.3.2 Data Direction Register A
Data direction register A (DDRA) determines whether each port A pin is an input or an output. Writing a 1
to a DDRA bit enables the output buffer for the corresponding port A pin; a 0 disables the output buffer.
DDRA[5:0] — Data Direction Register A Bits
These read/write bits control port A data direction. Reset clears DDRA[5:0], configuring all port A pins
as inputs.
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
NOTE
Avoid glitches on port A pins by writing to the port A data register before
changing data direction register A bits from 0 to 1.
Figure 12-3 shows the port A I/O logic.
Bit 76
5
4
3
2
1Bit 0
Read:
R
AWUL
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
Write:
Reset:
Unaffected by reset
= Unimplemented
Figure 12-1. Port A Data Register (PTA)
Bit 7
654
32
1
Bit 0
Read:
R
DDRA5
DDRA4
DDRA3
0
DDRA1
DDRA0
Write:
Reset:
0
000
00
R= Reserved
= Unimplemented
Figure 12-2. Data Direction Register A (DDRA)
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