参数资料
型号: MC68HC05J1AVDW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 93/128页
文件大小: 1279K
代理商: MC68HC05J1AVDW
Parallel Input/Output (I/O)
Port B
MC68HC05J1A — Rev. 3.0
Technical Data
MOTOROLA
Parallel Input/Output (I/O)
67
7.5 Port B
Port B is a 6-bit, general-purpose, bidirectional I/O port with
programmable pulldown devices.
7.5.1 Port B Data Register
The port B data register (PORTB) contains a bit for each of the port B
pins. When a port B pin is programmed to be an output, the state of its
data register bit determines the state of the output pin. When a port B pin
is programmed to be an input, reading the port B data register returns
the logic state of the pin.
PB5–PB0 — Port B Data Bits
These read/write bits are software programmable. Data direction of
each bit is under the control of the corresponding bit in the port B data
direction register.
Bits 7 and 6 — Not used
Bits 7 and 6 always read as logic 0s. Writes to these bits have no
effect.
Address:
$0001
Bit 7
6
54321
Bit 0
Read:
0
PB5
PB4
PB3
PB2
PB1
PB0
Write:
Reset:
Unaffected by reset
= Unimplemented
Figure 7-5. Port B Data Register (PORTB)
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