参数资料
型号: MCC68HC711D3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, UUC
封装: DIE
文件页数: 127/157页
文件大小: 2252K
代理商: MCC68HC711D3
Input/Output (I/O) Ports
Port D
MC68HC711D3 — Rev. 2
Data Sheet
MOTOROLA
Input/Output (I/O) Ports
71
5.4.3 Port C Data Direction Register
DDC7–DDC0 — Data Direction Bits for Port C
1 = Corresponding port C pin is configured as output
0 = Corresponding port C pin is configured for input only
5.5 Port D
Port D is an 8-bit, general-purpose I/O port with a data register (PORTD) and a data
direction register (DDRD). The eight port D bits (D7–D0) can be used for
general-purpose I/O, for the serial communications interface (SCI) and serial
peripheral interface (SPI) subsystems, or for bus data direction control
5.5.1 Port D Data Register
PORTD can be read at any time and inputs return the sensed levels at the pin;
whereas, outputs return the input level of the port D pin drivers. If PORTD is written,
the data is stored in an internal latch, and can be driven only if port D is configured
as general-purpose output. This port shares functions with the on-chip SCI and SPI
subsystems, while bits 6 and 7 control the direction of data flow on the bus in
expanded and special test modes.
Address:
$0007
Bit 7
654321
Bit 0
Read:
DDC7
DDC6
DDC5
DDC4
DDC3
DDC2
DDC1
DDC0
Write:
Reset:
00000000
Figure 5-6. Data Direction Register for Port C (DDRC)
Address:
$0008
Bit 7
654321
Bit 0
Read:
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
Write:
Reset:
00000000
Figure 5-7. Port D Data Register (PORTD)
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