m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 114

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

2. APPLICATION
Fig. 2.3.22 Control procedure [Data transmission or reception using automatic transfer]
100
Control procedure : In this example, a serial communication is performed at the beginning of the main routine
SIO1CON
SIOAC
SIOAI
SIODP
ICON1
RAM for processing
of a reception data
Serial I/O automatic transfer RAM
(Address:0F00
Initialization
Main processing
SIOAC (Address:1A
SIODP (Address:18
SIOAC (Address:1A
Has the time specified for the cycle
control of a main routine elapsed?
(Address:19
(Address:1A
(Address:1C
(Address:18
(Address:3E
16
which loops in a certain cycle.
to 0F07
RESET
16
)
Y
0
Serial I/O automatic
transfer RAM
(Address:0F00
16
16
16
16
16
16
)
)
)
), bit3
)
), bit 1
16
16
)
), bit1?
01001010
00000001
30
8 – 1
a transmission
data
3819 Group USER’S MANUAL
16
7
to 0F07
0
1
16
2
2
)
N
1
Initialize the serial I/O 1
Set the related functions for using automatic
transfer.
Generate the timing of a certain cycle by
using the timer or other functions.
Control so that the main routine is executed
in a certain cycle.
Set one block (8 byte) of transmission data
in the RAM.
Set the data pointer (set “8 byte – 1”).
Start the automatic transfer.
It is possible to execute the other process-
ing during an automatic transfer.
(a part of the main processing is executed.)
Check the completion of an automatic
transfer.
Transfer a data stored to the Serial I/O
automatic transfer RAM to RAM for
processing of reception data.
Perform the following processing in the main
processing.
1. The processing of the data transferred into
2. The preparation of the next transmission
the RAM for processing of reception data.
data.
MITSUBISHI MICROCOMPUTER
2.3 Serial I/O
3819 Group