Bidirectional Communication Function (Normal Mode) - Fujitsu MB90460 Series Hardware Manual

CHAPTER 17 UART
17.7.3

Bidirectional Communication Function (Normal Mode)

In operation mode 0 or 2, normal serial bidirectional communication (one-to-one
connection) is available. Select operation mode 0 for asynchronous communication
and operation mode 2 for synchronous communication.
■ Bidirectional Communication Function
The settings shown in Figure 17.7-4 are required to operate UART in normal mode (operation mode 0 or 2).
SCR0/SCR1,
SMR0/SMR1
Mode 0
Mode 2
SSR0/SSR1,
SIDR0/SIDR1
SODR0/SODR1
Mode 0
Mode 2
DDR4 (UART0)
DDR6 (UART1)
: Bit used
x : Bit not used
1 : Set "1"
0 : Set "0"
: Set "0" to use an input pin
●
Inter-CPU connection
As shown in Figure 17.7-5, interconnect two CPU's.
Figure 17.7-5 Connection Example of UART Bidirectional Communication
504
Figure 17.7-4 Settings for UART Operation Mode 0
bit 15 14 13 12
PEN P SBL CL AD
0 × × 1
PE OREFRE RDRFTDRE
× ×
SOT
SIN
Ouput
SCK
CPU-1
11 10 9 8 7 6
REC RXE TXE MD1 MD0 CS2
×
0 0 0
× 0 1 0
Set conversion data (during writing).
BDS RIE TIE
Retain receive data (during reading).
Input
5 4 3 2 1 0
CS1 CS0 RST SCKE SOE
×
×
SOT
SIN
SCK
CPU-2