SAB-C501G-1E24N SIEMENS [Siemens Semiconductor Group], SAB-C501G-1E24N Datasheet - Page 21

• Manufacturer Part Number: SAB-C501G-1E24N
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Serial Interface (USART)
The serial port is full duplex and can operate in four modes (one synchronous mode, three
asynchronous modes) as illustrated in table 6. The possible baudrates can be calculated using the
formulas given in table 7.
Table 6
USART Operating Modes
Mode
0
1
2
3
Table 7
Formulas for Calculating Baudrates
Semiconductor Group
Timer 1 (16-bit timer)
8-bit autoreload)
(8-bit timer with
derived from
Baud Rate
Oscillator
Timer 2
SM0
0
0
1
1
SCON
SM1
0
1
0
1
Timer 1/2 overflow rate
Timer 1/2 overflow rate
f
Interface Mode
OSC
Baudrate
/32 or
f
OSC
1,3
1,3
1,3
0
2
/12
f
OSC
/64
21
Description
Serial data enters and exits through R D.
T D outputs the shift clock. 8-bit are
transmitted/received (LSB first)
8-bit UART
10 bits are transmitted (through T D) or
received (R D)
9-bit UART
11 bits are transmitted (T D) or
received (R D)
9-bit UART
Like mode 2 except the variable baud rate
(2
f
(2
OSC
SMOD
SMOD
/ (32
f
OSC
(2
timer 1 overflow rate) /32
SMOD
) / (32
(65536-(RC2H, RC2L))
Baudrate
f
OSC
f
/12
OSC
12
) / 64
(256-TH1))
1997-04-01
C501