SAB80C517A-N18 Siemens Semiconductor Group, SAB80C517A-N18 Datasheet - Page 55

• Manufacturer Part Number: SAB80C517A-N18
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: Siemens Semiconductor Group

Serial Interfaces
The SAB 80C517A has two serial interfaces. Both interfaces are full duplex and receive
buffered. They are functionally identical with the serial interface of the SAB 8051 when working
as asynchronous channels. Serial interface 0 additionally has a synchronous mode. Table 9
shows possible configurations and the according baud rates.
Table 9
Baud Rate Generation
8-Bit
syn-
chron-
ous
channel
8-Bit
UART
9-Bit
UART
Semiconductor Group
Baud-
rate
derived from
Baud-
rate
derived from
Baud-
rate
derived
from
Mode
Mode
Mode
f
2 MHz
f
16 MHz
f
18 MHz
f
12 MHz
f
16 MHz
f
18 MHz
f
12 MHz
f
16 MHz
f
18 MHz
f
O SC
OSC
OSC
OSC
OSC
OSC
OSC/
OSC
O SC
O SC
=
=
2
=
=
=
=
=
=1
=
1MHz
1.33 MHz
1.5 MHz
f
1 Baud –
62.5 kBaud
1 Baud –
83 kBaud
1 Baud –
93.7 kBaud
Timer 1
Mode 2
187.5 kBaud/
375 kBaud
250 Baud/
500 kBaud
281.2 kBaud/
562.5 kBaud
Timer 1
OSC
Mode 0
54
1 Baud –
62.5 kBaud
1 Baud –
83.3 kBaud
1 Baud –
93.7 kBaud
10-Bit
Baudrate
Generator
Mode 1
Mode 3
SAB 80C517A/83C517A-5
183 Baud –
375 kBaud
244 Baud –
500 kBaud
2375 Baud –
562.5 kBaud
10-Bit
Baudrate
Generator
183 Baud –
75 kBaud
244 Baud –
500 kBaud
275 Baud
562.5 kBaud
–
–
–
–
–
Mode B
366 Baud –
375 kBaud
244 Baud –
500 kBaud
549 Baud –
562.5 kBaud
10-Bit
Baudrate
Generator
Mode A
183 Baud –
75 kBaud
244 Baud –
500 kBaud
549 Baud –
562.5 kBaud
10-Bit
Baudrate
Generator
1994-05-01