C509-L_97 Datasheet, PDF (171/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C509-L
Special Function Register S1RELH (Address BBH)
Special Function Register S1RELL (Address 9DH)
Reset Value : XXXXXX11B
Reset Value : 00H
Bit No. MSB
LSB
7
6
5
4
3
2
1
0
BBH
–
–
–
–
–
– MSB .0 S1RELH
7
6
5
4
3
2
1
0
9DH
.7
.6
.5
.4
.3
.2
.1 LSB _S1RELL
Bit
S1RELH.0-1
S1RELL.0-7
Function
Reload value. Upper two bits of the timer reload value.
Reload value. Lower 8 bit of timer reload value.
The baud rate in operating modes A and B can be determined by following formula:
Mode A, B baud rate =
oscillator frequency
32 x (baud rate generator overflow rate) x 2^S1P
Baud rate generator overflow rate = 2¹⁰ – S1REL
with S1REL = S1RELH.1 – 0, S1RELL.7 – 0
At 12-MHz oscillator frequency a baud rate range from about 366 baud up to 750 kbaud is covered.
Semiconductor Group
6-93
1997-10-01