Master/Slave Type Communication Function (Multi Processor Mode) - Fujitsu MB90895 Series Hardware Manual

CHAPTER 14 UART0
14.6.4 Master/slave type communication function (multi
processor mode)
Operation mode 1 allows communication between multiple CPUs connected in a
master/slave configuration.Note, however, that the function is available only to the
master side.
I Master/Slave Mode Communication Function
The UART0 requires the settings shown in Figure 14.6-9 to operate in operation mode 1.
SCR0 SMR0
SSR0
SIDR0/SODR0
DDR port direction register
: Undefined bit
: Used bit
: Unused bit
1 : Setting "1"
0 : Setting "0"
G
Inter-CPU connection
One master CPU and two or more slave CPUs are connected to a pair of common communication lines to
make up the master/slave communication system.The UART0 can be used only as the master CPU.
Figure 14.6-10 Example of Master/Slave Mode Communication Connect for UART0
Master CPU
424
Figure 14.6-9 Setting about UART0 operating mode 1
bit15 14 13 12 11
PEN P SBL CL AD
0 1
PE ORE FRE RDRFTDRE
SOT
SIN
SOT SIN
Slave CPU #0
10 9 bit8 bit7 6 5
REC RXE TXE
MD1 MD0 CS2
0 0 1
Setting transmission data (Write)
RIE TIE
/hold reception data (Read)
Setting "0" corresponding bit
used as SIN0 input pin, SCK0
input pin
SOT SIN
Slave CPU #1
4 3 2 1 bit0
Re-
CS1 CS0 SCKE SOE
served
0 0