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SCC2681AC1A44 Datasheet(PDF) 16 Page - NXP Semiconductors

Part # SCC2681AC1A44
Description  Dual asynchronous receiver/transmitter (DUART)
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SCC2681AC1A44 Datasheet(HTML) 16 Page - NXP Semiconductors

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Product data
SCC2681
Dual asynchronous receiver/transmitter (DUART)
2004 Apr 06
16
CSRA[7:4] – Channel A Receiver Clock Select
This field selects the baud rate clock for the Channel A receiver as
follows (X1 rate at 3.6864 MHz):
CSRA[7:4]
ACR[7] = 0
Baud Rate
ACR[7] = 1
0000
50
75
0001
110
110
0010
134.5
134.5
0011
200
150
0100
300
300
0101
600
600
0110
1,200
1,200
0111
1,050
2,000
1000
2,400
2,400
1001
4,800
4,800
1010
7,200
1,800
1011
9,600
9,600
1100
38.4k
19.2k
1101
Timer
Timer
1110
IP4–16
×
IP4–16
×
1111
IP4–1
×
IP4–1
×
(See also Table 5 for other rates to 115.2 kHz)
Rates will change in direct proportion to X1 at 3.6864 MHz.
The receiver clock is always a 16
× clock except for CSRA[7] = 1111.
CSRA[3:0] – Channel A Transmitter Clock Select
This field selects the baud rate clock for the Channel A transmitter.
The field definition is as per CSR[7:4] except as follows:
CSRA[3:0]
ACR[7] = 0
Baud Rate
ACR[7] = 1
1110
1111
IP3–16
×
IP3–1
×
IP3–16
×
IP3–1
×
The transmitter clock is always a 16
× clock except for
CSR[3:0] = 1111.
CSRB – Channel B Clock Select Register
CSRB[7:4] – Channel B Receiver Clock Select
This field selects the baud rate clock for the Channel B receiver. The
field definition is as per CSRA[7:4] except as follows:
CSRB[7:4]
ACR[7] = 0
Baud Rate
ACR[7] = 1
1110
1111
IP6–16
×
IP6–1
×
IP6–16
×
IP6–1
×
The receiver clock is always a 16
× clock except for CSRB[7:4] = 1111.
CSRB[3:0] – Channel B Transmitter Clock Select
This field selects the baud rate clock for the Channel B transmitter.
The field definition is as per CSRA[7:4] except as follows:
CSRB[3:0]
ACR[7] = 0
Baud Rate
ACR[7] = 1
1110
1111
IP5–16
×
IP5–1
×
IP5–16
×
IP5–1
×
The transmitter clock is always a 16
× clock except for
CSRB[3:0] = 1111.
CRA – Channel A Command Register
CRA is a register used to supply commands to Channel A. Multiple
commands can be specified in a single write to CRA as long as the
commands are non-conflicting, e.g., the ‘enable transmitter’ and
‘reset transmitter’ commands cannot be specified in a single
command word.
CRA[7] – Not Used
Must be set to zero.
CRA[6:4] – Channel A Miscellaneous Command
The encoded value of this field may be used to specify a single
command as follows:
CRA[6:4] – COMMAND
000
No command.
001
Reset MR pointer. Causes the Channel A MR pointer to point
to MR1.
010
Reset receiver. Resets the Channel A receiver as if a hard-
ware reset had been applied. The receiver is disabled and the
FIFO is flushed.
011
Reset transmitter. Resets the Channel A transmitter as if a
hardware reset had been applied.
100
Reset error status. Clears the Channel A Received Break,
Parity Error, and Overrun Error bits in the status register
(SRA[7:4]). Used in character mode to clear OE status (al-
though RB, PE and FE bits will also be cleared) and in block
mode to clear all error status after a block of data has been
received.
101
Reset Channel A break change interrupt. Causes the Chan-
nel A break detect change bit in the interrupt status register
(ISR[2]) to be cleared to zero.
110
Start break. Forces the TxDA output LOW (spacing). If the
transmitter is empty the start of the break condition will be
delayed up to two bit times. If the transmitter is active the
break begins when transmission of the character is com-
pleted. If a character is in the THR, the start of the break will
be delayed until that character, or any other loaded subse-
quently are transmitted. The transmitter must be enabled for
this command to be accepted.
111
Stop break. The TxDA line will go HIGH (marking) within two
bit times. TxDA will remain HIGH for one bit time before the
next character, if any, is transmitted.
CRA[3] – Disable Channel A Transmitter
This command terminates transmitter operation and reset the
TxDRY and TxEMT status bits. However, if a character is being
transmitted or if a character is in the THR when the transmitter is
disabled, the transmission of the character(s) is completed before
assuming the inactive state. A disable transmitter cannot be loaded.
CRA[2] – Enable Channel A Transmitter
Enables operation of the Channel A transmitter. The TxRDY status
bit will be asserted.
CRA[1] – Disable Channel A Receiver
This command terminates operation of the receiver immediately – a
character being received will be lost. The command has no effect on
the receiver status bits or any other control registers. If the special
multidrop mode is programmed, the receiver operates even if it is
disabled. See Operation section.
CRA[0] – Enable Channel A Receiver
Enables operation of the Channel A receiver. If not in the special
wake up mode, this also forces the receiver into the search for
start-bit state.
Note: Performing disable and enable at the same time results in
disable.


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