SC28L91 Philips Semiconductors, SC28L91 Datasheet - Page 26

• Manufacturer Part Number: SC28L91
• Description: 3.3V-5.0V Universal Asynchronous Receiver/Transmitter (UART)
• Manufacturer: Philips Semiconductors

1. The receiver clock is always a 16X clock except for CSR[7:4] = 1111. CSR[3:0]— Transmitter Clock Select. This field selects the baud rate
Duty cycle of 16X clock is 50%
Philips Semiconductors
CSR CLOCK SELECT REGISTER
Table 5.
NOTE:
The field definition is as shown in Table 5, except as follows:
The transmitter clock is always a 16X clock except for CSR[3:0] = 1111.
Table 6. Bit rate generator characteristics for Crystal or Clock = 3.6864MHz
NOTE:
2000 Sep 22
Addr
CSR
0x01
CSRA[7:4]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
CSR[3:0]
1110
1111
NORMAL RATE (BAUD)
50
75
110
134.5
150
200
300
600
1050
1200
1800
2000
2400
4800
7200
9600
19.2K
38.4K
3.3V–5.0V Universal Asynchronous
Receiver/Transmitter (UART)
clock for the transmitter.
Baud rate (base on a 3.6864MHz crystal clock)
CSR (7:4)
RECEIVER CLOCK SELECT
See Text and table 5
MR0[0] = 0 (Normal Mode)
ACR[7] = 0
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
1%
IP3 –16X
IP3 –1X
ACR[7] = 1
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
ACTUAL 16X CLOCK (KHz)
0.8
1.2
1.759
2.153
2.4
3.2
4.8
9.6
16.756
19.2
28.8
32.056
38.4
76.8
115.2
153.6
307.2
614.4
MR0[0] = 1 (Extended Mode I)
ACR[7] = 0
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
26
CSR (3:0)
TRANSMITTER CLOCK SELECT
See Text and table 5
ACR[7] = 1
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
ERROR (%)
0
0
–0.069
0.059
0
0
0
0
–0.260
0
0
0.175
0
0
0
0
0
0
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
Product specification
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
SC28L91