m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 116

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
Fig. 2.3.24 Timing chart [Cyclic transmission or reception of block data between microcomputers]
Fig. 2.3.25 Setting of related registers [Cyclic transmission or reception of block data between microcomputers]
102
The communication is performed according to the timing shown below. In the slave unit, when a synchronizing clock
is not input within a certain time (heading adjustive time), the next clock input is processed as the beginning (heading)
of a block.
When a clock is input again after one block (8 byte) is received, the clock is ignored.
Figure 2.3.25 shows a setting of related registers.
[When using the Serial I/O 1]
SIO1CON
SIOAC
Serial I/O 1 control register (Address:19
Serial I/O automatic transfer control register (Address:1A
Master unit
0
1
0
0
Byte cycle
1
D
0
0
1
Block transmission period
Block transmission cycle
0
0
Internal synchronous
clock : f(X
Use the Serial I/O 1
Not use the S
output function
LSB first
Internal clock
CMOS output
D
1
Serial I/O ordinary mode
D
3819 Group USER’S MANUAL
IN
2
)/32
RDY1
16
)
Processing for heading adjustment
signal
D
7
SIO1CON
Interval between blocks
Note :
Heading adjustive time
Slave unit
16
)
Serial I/O 1 control register (Address:19
0
When an automatic transfer function
is not used, the S
I/O pin for a synchronizing clock (the
S
CLK12
0
0
D
is not selected).
0
0
1
MITSUBISHI MICROCOMPUTER
CLK11
2.3 Serial I/O
Not be effected by
external clock
Not use the S
output function
LSB first
External clock
CMOS output
Use the Serial I/O 1
is used as an
3819 Group
RDY1
16
)
signal