Download MC68HC681 User`s Manual - Freescale Semiconductor

Freescale Semiconductor, Inc.
Programming and Register Descriptions
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Force Parity
0 = Low
1 = High
Multidrop Mode
0 = Data
1 = Address
Bits-per-Character (Bits 1 and 0)
00=5
01=6
10=7
11=8
Channel A Mode Register 2 (MR2A/MR2B)
7
6
5
4
CHANNEL MODE
TX RTS
CTS
3
2
STOP BIT LENGTH
1
0
4
UNUSED
Channel Mode (Bits 7 and 6)
0 0 = Normal
0 1 = Automatic Echo
1 0 = Local Loopback
1 1 = Remote Loopback
Tx RTS—Control
0 = Disabled
1 = Enabled
CTS—Enable Transmitter
0 = Disabled
1 = Enabled
Stop Bit Length (Bits 3, 2)
0 0 = 1 Stop Bit
0 1 = 1 Stop Bit
1 0 = 1.5 Stop Bits (Async mode); 2 Stop Bits (Sync mode)
1 1 = 2 Stop Bits
Clock-Select Register A/B (CSRA/CSRB)
7
6
5
4
RECEIVER-CLOCK SELECT
MOTOROLA
3
2
1
TRANSMITTER CLOCK SELECT
MC68HC681 USER’S MANUAL
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