s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 154

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface (SCI)
16.7.2 PTE1/SCRxD (Receive Data)
The PTE1/SCRxD pin is the serial data input to the SCI receiver. The SCI shares the PTE1/SCRxD pin
with port E. When the SCI is enabled, the PTE1/SCRxD pin is an input regardless of the state of the
DDRE1 bit in data direction register E (DDRE).
16.8 I/O Registers
The following I/O registers control and monitor SCI operation:
16.8.1 SCI Control Register 1
SCI control register 1:
LOOPS — Loop Mode Select Bit
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This read/write bit enables loop mode operation. In loop mode the 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
Figure 16-11. SCI Control Register 1 (SCC1)
ENSCI
6
0
MC68HC908AZ32A Data Sheet, Rev. 2
TXINV
5
0
M
4
0
WAKE
3
0
ILLTY
2
0
PEN
1
0
Freescale Semiconductor
Bit 0
PTY
0