Fujitsu MB90390 Series Hardware Manual page 368

CHAPTER 20 UART2, UART3
■ UART2, UART3 Operation Modes
The UART2, UART3 operates in four different modes, which are determined by the MD0- and the MD1-
bit of the Serial mode register (SMR2/SMR3). Mode 0 and 2 are used for bidirectional serial
communication, mode 1 for master/slave communication and mode 3 for LIN master/slave communication.
Table 20.1-2 UART2, UART3 Operation Modes
Operation mode
0 normal mode
1 multiprocessor
2 normal mode
3 LIN mode
*1: means the data bit transfer format: LBS first or MSB first.
*2: "+1" means the indicator bit of the address/data selection in the multiprocessor mode, instead of parity.
Note:
Mode 1 operation is supported both for master or slave operation of UART2, UART3 in a master/
slave connection system. In Mode 3 the UART2, UART3 function is locked to 8N1-Format, LSB first.
If the mode is changed, UART2, UART3 cuts off all possible transmission or reception and awaits then
new action.
The MD1 and MD0 bit of the Serial Mode Register (SMR2/SMR3) determine the operation mode of
UART2, UART3 as shown in the following table:
Table 20.1-3 Mode Bit Setting
MD1
0
0
1
1
340
Data length
parity disabled parity enabled
7 bits or 8 bits
7 bits or 8 bits
*2
+ 1
8 bits
8 bits
MD0 Mode
0 0 Asynchronous (normal mode)
1 1 Asynchronous (multiprocessor mode)
0 2 Synchronous (normal mode)
1 3 Asynchronous (LIN mode)
Synchronization of
mode
asynchronous
- asynchronous
synchronous
- asynchronous
Description
data bit
Length of
stop bit
direction
1 bit or 2 bits L/M
1 bit or 2 bits L/M
0 bit, 1 bit or
L/M
2 bits
1 bit L
*1