C868 Datasheet, PDF (41/82 Pages) Infineon Technologies AG – 8-Bit Single-Chip Microcontroller

C868
The baudrates in Mode 1 and 3 are determined by the timer overflow rate. These
baudrates can be determined by Timer 1 or by Timer 2 or both (one for transmit, the other
for receive.
Table 11 Serial Interface - Baud Rate Dependencies
Serial Interface
Operating Modes
Active Control Bits Baud Rate Calculation
TCLK/
RCLK
SMOD
Mode 1 (8-bit UART) 0
x
Controlled by timer 1 overflow:
Mode 3 (9-bit UART)
(2^SMOD × Timer 1 overflow rate) / 32
1
x
Controlled by baud rate generator
(2^SMOD × Timer 2¹⁾ overflow rate) / 32
Mode 2 (9-bit UART) –
0
1
1) _{Timer 2 functioning as baudrate generator}
f_SYS / 64
f_SYS / 32
Data Sheet
41
V 1.0, 2003-05