參數(shù)資料
型號(hào): MC68HC705J
廠商: Motorola, Inc.
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 92/162頁
文件大小: 683K
代理商: MC68HC705J
Technical Data
MC68HC705J1A
Rev. 4.0
92
Parallel Input/Output (I/O) Ports
MOTOROLA
Parallel Input/Output (I/O) Ports
6.3.4 Port A LED Drive Capability
The outputs for the upper four bits of port A (PA4
PA7) can drive
light-emitting diodes (LEDs). PA4
PA7
can sink approximately 10 mA of
current to V
SS
.
6.3.5 Port A I/O Pin Interrupts
If the PIRQ bit in the mask option register is programmed to logic 1,
PA0
PA3 pins function as external interrupt pins. See
Section 8.
External Interrupt Module (IRQ)
.
6.4 Port B
Port B is a 6-bit bidirectional port.
6.4.1 Port B Data Register
The port B data register (PORTB) contains a latch for each port B pin.
PB[5:0]
Port B Data Bits
These read/write bits are software programmable. 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.
Address:
$0001
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
PB5
PB4
PB3
PB2
PB1
PB0
Write:
Reset:
Unaffected by reset
= Unimplemented
Figure 6-6. Port B Data Register (PORTB)
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