Uart Operations - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 21 UART

21.3 UART Operations

This section describes the operations of the UART.
I Operation modes
UART has the operation modes shown below. The modes can be changed by setting values in
the SMR and SCR Registers.
Mode Parity
0 Provided/not provided
Provided/not provided
1 None
2 None
*1: The "+1" term represents the address/data selection bit (A/D) used in communication control.
*2: Only one bit can be detected as stop bit during reception.
The stop bit length in asynchronous (start-stop) mode can only be specified for send operations.
The bit length in reception operations is always one bit. Only the modes above are supported for
operation; do not set any other mode.
UART operation mode 1 is used only for the master in master/slave connection.
❍ Connection between CPUs
1:1 connection (normal mode) or master/slave connection (multiprocessor mode) can be
selected. The data length, whether or not to add a parity bit, synchronization, and other
specifications for these two systems must be the same across all CPUs. The following operation
modes can be selected:
• In 1:1 connection (normal mode), the same operation mode, either operation mode 0 or
operation mode 2, must be selected for both CPUs.
Select Operation Mode 0 for asynchronous operation. Select Operation Mode 2 for
synchronous operation.
• In master/slave connection (multiprocessor mode), use Operation Mode 1. Select operation
mode 1 and use this device as the master. For this type of connection, select "no parity".
406
Data length Operation mode
7
Asynchronous (start-stop)
normal mode
8
Asynchronous (start-stop)
8 + 1 (*1)
multiprocessor mode
8 CLK synchronous mode
Stop bit length
1 bit or 2 bits (*2)
None