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: 126/157页
文件大小: 2252K
代理商: MCC68HC711D3
Input/Output (I/O) Ports
Data Sheet
MC68HC711D3 — Rev. 2
70
Input/Output (I/O) Ports
MOTOROLA
5.4 Port C
Port C is an 8-bit, general-purpose I/O port with a data register (PORTC) and a data
direction register (DDRC). In the single-chip mode, port C pins are general-purpose
I/O pins (PC7–PC0). In the expanded-multiplexed mode, port C pins are configured
as multiplexed address/data pins. During the address cycle, bits 7–0 of the address
are output on PC7–PC0. During the data cycle, bits 7–0 (PC7–PC0) are
bidirectional data pins controlled by the R/W signal.
5.4.1 Port C Control Register
CWOM — Port C Wire-OR Mode Bit
1 = Port C outputs are open drain (to facilitate testing)
0 = Port C operates normally
5.4.2 Port C Data Register
PORTC can be read at any time. Inputs return the sensed levels at the pin, while
outputs return the input level of the port C pin drivers. If PORTC is written, the data
is stored in an internal latch and can be driven only if port C is configured for
general-purpose outputs in single-chip or bootstrap mode.
Port C pins are general-purpose inputs out of reset in single-chip and bootstrap
modes. These pins are multiplexed low-order address and data bus lines out of
reset in expanded-multiplexed and test modes.
Address:
$0002
Bit 7
654321
Bit 0
Read:
00
CWOM
00000
Write:
Reset:
00000000
Figure 5-4. Port C Control Register (PIOC)
Address:
$0003
Bit 7
654321
Bit 0
Read:
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
Write:
Reset:
00000000
Figure 5-5. Port C Data Register (PORTC)
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