参数资料
型号: MC68HC711D3MP2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDIP40
封装: PLASTIC, DIP-40
文件页数: 124/157页
文件大小: 2252K
代理商: MC68HC711D3MP2
Input/Output (I/O) Ports
Port B
MC68HC711D3 — Rev. 2
Data Sheet
MOTOROLA
Input/Output (I/O) Ports
69
5.3 Port B
Port B is an 8-bit, general-purpose I/O port with a data register (PORTB) and a data
direction register (DDRB).
In the single-chip mode, port B pins are general-purpose I/O pins
(PB7–PB0).
In the expanded-multiplexed mode, all of the port B pins act as the
high-order address bits (A15–A8) of the address bus.
5.3.1 Port B Data Register
PORTB can be read at any time. Inputs return the sensed levels at the pin, while
outputs return the input level of the port B pin drivers. If PORTB is written, the data
is stored in an internal latch and can be driven only if port B is configured for
general-purpose outputs in single-chip or bootstrap mode.
Port B pins are general--purpose inputs out of reset in single-chip and bootstrap
modes. These pins are outputs (the high-order address bits) out of reset in
expanded multiplexed and test modes.
5.3.2 Port B Data Direction Register
DDB7–DDB0 — Data Direction Bits for Port B
1 = Corresponding port B pin configured as output
0 = Corresponding port B pin configured for input only
Address:
$0004
Bit 7
654321
Bit 0
Read:
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
Write:
Reset:
00000000
Alt. Func.:
A15
A14
A13
A12
A11
A10
A9
A8
Figure 5-2. Port B Data Register (PORTB)
Address:
$0006
Bit 7
654321
Bit 0
Read:
DDB7
DDB6
DDB5
DDB4
DDB3
DDB2
DDB1
DDB0
Write:
Reset:
00000000
Figure 5-3. Data Direction Register for Port B (DDRB)
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