MC68HC908GR8CD Freescale Semiconductor, MC68HC908GR8CD Datasheet - Page 175

• Manufacturer Part Number: MC68HC908GR8CD
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908GR8CD

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 384 B
• Operating Supply Voltage: 3 V to 5 V
• Package / Case: SOIC-28
• Mounting Style: SMD/SMT
• Data Rom Size: 64 KB
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 21
• Program Memory Type: Flash

18.7.2 PE1/RxD (Receive Data)
The PE1/RxD pin is the serial data input to the SCI receiver. The SCI shares the PE1/RxD pin with port E.
When the SCI is enabled, the PE1/RxD pin is an input regardless of the state of the DDRE1 bit in data
direction register E (DDRE).
18.8 I/O Registers
These I/O registers control and monitor SCI operation:
18.8.1 SCI Control Register 1
SCI control register 1:
LOOPS — Loop Mode Select Bit
Freescale Semiconductor
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This read/write bit enables loop mode operation. In loop mode the PE1/RxD pin is disconnected from
the SCI, and the transmitter output goes into the receiver input. Both the transmitter and the receiver
must be enabled to use loop mode. Reset clears the LOOPS bit.
1 = Loop mode enabled
0 = Normal operation enabled
SCI control register 1 (SCC1)
SCI control register 2 (SCC2)
SCI control register 3 (SCC3)
SCI status register 1 (SCS1)
SCI status register 2 (SCS2)
SCI data register (SCDR)
SCI baud rate register (SCBR)
Enables loop mode operation
Enables the SCI
Controls output polarity
Controls character length
Controls SCI wakeup method
Controls idle character detection
Enables parity function
Controls parity type
Address:
Reset:
Read:
Write:
LOOPS
$0013
Bit 7
0
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
Figure 18-9. SCI Control Register 1 (SCC1)
ENSCI
6
0
TXINV
5
0
M
4
0
WAKE
3
0
ILTY
2
0
PEN
1
0
Bit 0
PTY
0
I/O Registers
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