SC26C92C1B View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
'SC26C92C1B' PDF : 31 Pages View PDF
Philips Semiconductors
Dual universal asynchronous receiver/transmitter (DUART)
Product specification
SC26C92
applied via CRB. After reading or writing MR0B, the pointer will
point to MR1B.
The bit definitions for this register are identical to MR0A, except that
all control actions apply to the Channel B receiver and transmitter
and the corresponding inputs and outputs. MR0B[3:0] are reserved.
MR1B – Channel B Mode Register 1
MR1B is accessed when the Channel B MR pointer points to MR1.
The pointer is set to MR1 by RESET or by a ‘set pointer’ command
applied via CRB. After reading or writing MR1B, the pointer will
point to MR2B.
The bit definitions for this register are identical to MR1A, except that
all control actions apply to the Channel B receiver and transmitter
and the corresponding inputs and outputs.
MR2B – Channel B Mode Register 2
MR2B is accessed when the Channel B MR pointer points to MR2,
which occurs after any access to MR1B. Accesses to MR2B do not
change the pointer.
The bit definitions for mode register are identical to the bit
definitions for MR2A, except that all control actions apply to the
Channel B receiver and transmitter and the corresponding inputs
and outputs.
CSRA – Channel A Clock Select Register
CSRA[7:4] – Channel A Receiver Clock Select
This field selects the baud rate clock for the Channel A receiver.
The field definition is shown in Table 5.
CSRB[7:4]
ACR[7] = 0
ACR[7] = 1
1110
1111
IP4-16X
IP4-1X
IP4-16X
IP4-1X
The receiver clock is always a 16X clock except for CSRB[7:4] = 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 shown in Table 5, except as follows:
CSRA[3:0]
ACR[7] = 0
ACR[7] = 1
1110
1111
IP3-16X
IP3-1X
IP3-16X
IP3-1X
The transmitter clock is always a 16X 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 shown in Table 5, except as follows:
CSRB[7:4]
ACR[7] = 0
ACR[7] = 1
1110
1111
IP6-16X
IP6-1X
IP6-16X
IP6-1X
The receiver clock is always a 16X 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 shown in Table 5, except as follows:
CSRB[3:0]
ACR[7] = 0
ACR[7] = 1
1110
1111
IP5-16X
IP5-1X
IP5-16X
IP5-1X
The transmitter clock is always a 16X clock except for
CSRB[3:0] = 1111.
Table 5. Baud Rate (Base on a 3.6864MHz crystal clock)
MR0[0] = 0 (Normal Mode)
MR0[0] = 1 (Extended Mode I)
CSRA[7:4]
ACR[7] = 0
ACR[7] = 1
ACR[7] = 0
ACR[7] = 1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
50
110
134.5
200
300
600
1,200
1,050
2,400
4,800
7,200
9,600
38.4K
Timer
IP4-16X
IP4-1X
75
110
134.5
150
300
600
1,200
2,000
2,400
4,800
1,800
9,600
19.2K
Timer
IP4-16X
IP4-1X
300
110
134.5
1200
1800
3600
7200
1,050
14.4K
28.8K
7,200
57.6K
230.4K
Timer
IP4-16X
IP4-1X
450
110
134.5
900
1800
3600
7,200
2,000
14.4K
28.8K
1,800
57.6K
115.2K
Timer
IP4-16X
IP4-1X
NOTE: The receiver clock is always a 16X clock except for CSRA[7:4] = 1111.
MR0[2] = 1 (Extended Mode II)
ACR[7] = 0
4,800
880
1,076
19.2K
28.8K
57.6K
115.2K
1,050
57.6K
4,800
57.6K
9,600
38.4K
Timer
IP4-16X
IP4-1X
ACR[7] = 1
7,200
880
1,076
14.4K
28.8K
57.6K
115.2K
2,000
57.6K
4,800
14.4K
9,600
19.2K
Timer
IP4-16X
IP4-1X
2000 Jan 31
18
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