MC68HC908GZ8 Datasheet, PDF (235/344 Pages) Motorola, Inc – Microcontrollers

Enhanced Serial Communications Interface (ESCI) Module
I/O Registers
19.8 I/O Registers
These I/O registers control and monitor ESCI operation:
• ESCI control register 1, SCC1
• ESCI control register 2, SCC2
• ESCI control register 3, SCC3
• ESCI status register 1, SCS1
• ESCI status register 2, SCS2
• ESCI data register, SCDR
• ESCI baud rate register, SCBR
• ESCI prescaler register, SCPSC
• ESCI arbiter control register, SCIACTL
• ESCI arbiter data register, SCIADAT
19.8.1 ESCI Control Register 1
ESCI control register 1 (SCC1):
• Enables loop mode operation
• Enables the ESCI
• Controls output polarity
• Controls character length
• Controls ESCI wakeup method
• Controls idle character detection
• Enables parity function
:
• Controls parity type
Address: $0013
Bit 7
6
5
4
3
2
1
Bit 0
Read: _LOOPS
ENSCI
TXINV
M
WAKE
ILTY
PEN
PTY
Write:
Reset:
0
0
0
0
0
0
0
0
Figure 19-9. ESCI Control Register 1 (SCC1)
LOOPS — Loop Mode Select Bit
This read/write bit enables loop mode operation. In loop mode the RxD pin is
disconnected from the ESCI, 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
MC68HC908GZ8
Freescale Semiconductor
Enhanced Serial Communications Interface (ESCI) Module
Data Sheet
235