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参数资料
| 型号： | MC68HC11C0MFN2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 2 MHz, MICROCONTROLLER, PQCC68 |
| 封装： | PLASTIC, LCC-68 |
| 文件页数： | 55/76页 |
| 文件大小： | 394K |
| 代理商： | MC68HC11C0MFN2 |
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MC68HC11C0
MOTOROLA
MC68HC11C0TS/D
59
Notes:
1. If a pin is configured for general-purpose I/O, the DDRD bit controls the direction of data.
2. If a pin is configured for RxD input, there is no weak pull-up at the pin.
3. If a pin is configured for TxD output, the output can be either an open-drain output or a CMOS driver. This is
controlled by the port D driver output mode (DODM) register.
4. TE is the transmitter enable bit. RE is the receiver enable bit. Refer to the SCCR2 register.
NOTE
If any of the pins PD[5:2] are configured as SPI inputs they will not have pull-ups.
If any of the pins PD[5:2] are configured as SPI outputs they will be either open-
drain outputs or normal CMOS driver outputs depending on the state of the corre-
sponding bit in the DODM register.
Each DODM bit controls an individual port D pin and is valid only if the pin is configured as an output.
DOD[6:0] — Port D Open Drain Bits [6:0]
0 = Corresponding port D output pin configured as normal CMOS driver.
1 = Corresponding port D output pin configured as open-drain output driver.
10.1 Serial Communications Interface (SCI)
The SCI is a universal asynchronous receiver transmitter (UART) serial communications interface, an
independent serial I/O subsystem in the MC68HC11C0. It has a standard NRZ format (one start bit,
eight or nine data bits and one stop bit) and several baud rates available. The SCI transmitter and re-
ceiver are independent, but use the same data format and bit rate. Refer to the two tables in the BAUD
register description for a summary of the SCI baud rate values.
The MC68HC11C0 SCI system supports single-wire transmit and receive operation. Although SCI sys-
tems in other M68HC11 MCUs support external wire-OR operation, two pins are necessary to perform
that function. The DIO0 bit in DIOCTL register controls the SCI mode of operation. When single-wire
operation is selected (DIO0 = 1), the SCI uses only PD1 for its transmit and receive signals. In this
mode, if the receiver is enabled, PD1 is the RxD input; if the transmitter is enabled, PD1 is the TxD out-
put. If both the receiver and the transmitter are enabled, both RxD and TxD are internally tied together
Table 15 PD[1:0] Configuration
DIOCTL
Bit 0
SCI Enables
PD1
Pull-Up
Control
SCI Enables
PD0
Pull-Up
Control
SCI
Mode
0
TE = 1
TxD
Off
RE = 1
RxD
Off
Two Wire
TE = 0
I/O
DDD1
RE = 0
I/O
DDD0
1
TE = 1
TxD
Off
X
I/O
DDD0
Single Wire
RE = 0
TE = 1
RxD
Off
RE = 0
TE = 1
RxD/TxD
Off
RE = 0
Looped
TE = 1
I/O
DDD1
RE = 0
DODM — Port D Open Drain Mode
$0075
Bit 7
654321
Bit 0
—
DOD6
DOD5
DOD4
DOD3
DOD2
DOD1
DOD0
RESET:
00000000
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