SAF-XC886LM-8FFI INFINEON [Infineon Technologies AG], SAF-XC886LM-8FFI Datasheet - Page 78

• Manufacturer Part Number: SAF-XC886LM-8FFI
• Description: 8-Bit Single-Chip Microcontroller
• Manufacturer: INFINEON [Infineon Technologies AG]

3.11
The XC886/888 provides two Universal Asynchronous Receiver/Transmitter (UART and
UART1) modules for full-duplex asynchronous reception/transmission. Both are also
receive-buffered, i.e., they can commence reception of a second byte before a
previously received byte has been read from the receive register. However, if the first
byte still has not been read by the time reception of the second byte is complete, one of
the bytes will be lost.
Features:
• Full-duplex asynchronous modes
• Receive buffered
• Multiprocessor communication
• Interrupt generation on the completion of a data transmission or reception
The UART modules can operate in four asynchronous modes as shown in
Data is transmitted on TXD and received on RXD.
Table 28
Operating Mode
Mode 0: 8-bit shift register
Mode 1: 8-bit shift UART
Mode 2: 9-bit shift UART
Mode 3: 9-bit shift UART
1)
There are several ways to generate the baud rate clock for the serial port, depending on
the mode in which it is operating. In mode 0, the baud rate for the transfer is fixed at
f
and can be configured to either f
is available. The variable baud rate is set by the underflow rate on the dedicated baud-
rate generator. For UART module, the variable baud rate alternatively can be set by the
overflow rate on Timer 1.
Data Sheet
Prelimary
PCLK
– 8-bit or 9-bit data frames, LSB first
– fixed or variable baud rate
For UART1 module, the baud rate is fixed at f
/2. In mode 2, the baud rate is generated internally based on the UART input clock
UART and UART1
UART Modes
PCLK
/32 or f
PCLK
/64.
Variable
f
Variable
Baud Rate
f
PCLK
PCLK
74
PCLK
/2
/32 or f
/64. For UART1 module, only f
PCLK
/64
1)
Functional Description
XC886/888CLM
V0.1, 2006-02
Table
PCLK
28.
/64