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ST7285C Datasheet(HTML) 32 Page - STMicroelectronics

Part No. ST7285C
Description  8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7285C Datasheet(HTML) 32 Page - STMicroelectronics

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ST7285C
SERIAL COMMUNICATIONS INTERFACE(Cont’d)
This TR factor is used only when the PSBRT fine
tuning factor is equal to 0; otherwise, TR is re-
placed by the PSBRT dividing factor.
Bit-2 = SCR2
Receiver rate divisor MSB
Bit-1 = SCR1
Receiver rate divisor NSB
Bit-0 = SCR0
Receiver rate divisor LSB
These 3 bits, in conjunction with the 2 previous bits
define the total division applied to the bus clock to
yield the receive rate clock in conventional Baud
Rate Generator mode..
This RR factor is used only when the PSBRR fine
tuning factor is equal to 0; otherwise, RR is re-
placed by the PSBRR dividing factor.
4.2.7.6 External Receive Prescaler Division
Register (PSCBRR)
Address: 0055h
Read/Write
Reset Value: 00h
Allows setting of the External Prescaler rate divi-
sion factor for the receive circuit.
When the register is set to 00h, the conventional
Baud Rate Generator is used for the receive cir-
cuit, otherwise the master clock frequency is divid-
ed by the binary factor set in the PSCBRR register
(in the range 1 to 255).
4.2.7.7 External Transmit Prescaler Division
Register (PSCBRT)
Address: 0057h
Read/Write
Reset Value: 00h
Allows setting of the External Prescaler rate divi-
sion factor for the transmit circuit.
When the register is set to 00h, the conventional
Baud Rate Generator is used for the transmit cir-
cuit, otherwise the master clock frequency is divid-
ed by the binary factor set in the PSCBRTregister
(in the range 1 to 255).
SCT2
SCT1
SCT0
TR dividing factor
00
0
1
00
1
2
01
0
4
01
1
8
10
0
16
10
1
32
11
0
64
1
1
1
128
SCR2
SCR1
SCR0
RR dividing factor
00
0
1
00
1
2
01
0
4
01
1
8
10
0
16
10
1
32
11
0
64
1
1
1
128
76
5
4321
0
PRBR
7
PRBR
6
PRBR
5
PRBR
4
PRBR
3
PRBR
2
PRBR
1
PRBR
0
76
5
4321
0
PTBR
7
PTB R
6
PTBR
5
PTB R
4
PTBR
3
PTB R
2
PTBR
1
PTB R
0


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