参数资料
型号: MC68HC05P9AMDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 127/158页
文件大小: 3885K
代理商: MC68HC05P9AMDW
Parallel I/O Ports
70
Parallel I/O Ports
Port A I/O Pin
Interrupts/Pullups
If the port A interrupt/pullup enabled mask option is selected the
PA0–PA7 pins will function as external interrupt pins when configured as
Port B
Port B is a 3-bit I/O port that shares its pins with the serial I/O port
(SIOP).
NOTE:
Do not use port B for general-purpose I/O while the SIOP is enabled.
Port B Data
Register (PORTB)
The port B data register contains a latch for each of the three port B pins.
PB[7:5] — Port B Data Bits
These read/write bits are software programmable bits. Data direction
of each port B pin is under the control of the corresponding bit in data
direction register B. Reset has no effect on port B data.
NOTE:
Writing to data direction register B does not affect the data direction of
port B pins that are being used by the SIOP. However, data direction
register B always determines whether reading port B returns the states
of the latches or the states of the pins.
$0001
Bit 7
654321
Bit 0
Read:
PB7
PB6
PB5
00000
Write:
Reset:
Unaffected by reset
Alternate
Function:
SCK
SDI
SDO
= Unimplemented
Figure 32. Port B Data Register (PORTB)
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For More Information On This Product,
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