Philips Semiconductors
Product specification
Dual asynchronous receiver/transmitter (DUART)
SCC2692
Table 1. SCC2692 Register Addressing
A3
A2
A1
A0
READ (RDN = 0)
WRITE (WRN = 0)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Mode Register A (MR1A, MR2A)
Status Register A (SRA)
BRG Test
Mode Register A (MR1A, MR2A)
Clock Select Register A (CSRA)
Command Register A (CRA)
Tx Holding Register A (THRA)
Aux. Control Register (ACR)
Interrupt Mask Register (IMR)
C/T Upper Preset Value (CRUR)
C/T Lower Preset Value (CTLR)
Mode Register B (MR1B, MR2B)
Clock Select Register B (CSRB)
Command Register B (CRB)
Tx Holding Register B (THRB)
Reserved
Rx Holding Register A (RHRA)
Input Port Change Register (IPCR)
Interrupt Status Register (ISR)
Counter/Timer Upper Value (CTU)
Counter/Timer Lower Value (CTL)
Mode Register B (MR1B, MR2B)
Status Register B (SRB)
1X/16X Test
Rx Holding Register B (RHRB)
Reserved
Input Ports IP0 to IP6
Start Counter Command
Stop Counter Command
Output Port Conf. Register (OPCR)
Set Output Port Bits Command
Reset Output Port Bits Command
* See Table 6 for BRG Test frequencies in this data sheet, and “Extended baud rates for SCN2681, SCN68681, SCC2691, SCC2692,
SCC68681 and SCC2698B” in application notes elsewhere in this publication
Table 2. Register Bit Formats
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
RxRTS
CONTROL
RxINT
SELECT
ERROR
MODE*
PARITY
TYPE
BITS PER
CHARACTER
PARITY MODE
MR1A
MR1B
00 = With Parity
01 = Force Parity
10 = No Parity
00 = 5
01 = 6
10 = 7
11 = 8
0 = No
1 = Yes
0 = RxRDY
1 = FFULL
0 = Char
1 = Block
0 = Even
1 = Odd
11 = Multidrop Mode
NOTE:
*In block error mode, block error conditions must be cleared by using the error reset command (command 4x) or a receiver reset.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxRTS
CONTROL
CTS
ENABLE Tx
CHANNEL MODE
STOP BIT LENGTH*
MR2A
MR2B
00 = Normal
0 = 0.563
1 = 0.625
2 = 0.688
3 = 0.750
4 = 0.813
5 = 0.875
6 = 0.938
7 = 1.000
8 = 1.563
9 = 1.625
A = 1.688
B = 1.750
C = 1.813
D = 1.875
E = 1.938
F = 2.000
01 = Auto-Echo
10 = Local loop
11 = Remote loop
0 = No
1 = Yes
0 = No
1 = Yes
NOTE: *Add 0.5 to values shown for 0 – 7 if channel is programmed for 5 bits/char.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
CSRA
CSRB
RECEIVER CLOCK SELECT
TRANSMITTER CLOCK SELECT
See Text
See Text
* See Table 6 for BRG Test frequencies in this data sheet, and “Extended baud rates for SCN2681, SCN68681, SCC2691, SCC2692,
SCC68681 and SCC2698B” in application notes elsewhere in this publication
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
CRA
CRB
MISCELLANEOUS COMMANDS
DISABLE Tx
ENABLE Tx
DISABLE Rx
ENABLE Rx
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
0 = No
1 = Yes
See Text and Timing Requirement
NOTE: Access to the miscellaneous commands should be separated by 3 X1 clock edges. A disabled transmitter cannot be loaded.
11
1998 Sep 04
NXP [ NXP ]
