m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 110

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

2. APPLICATION
Fig. 2.3.17 Control procedure [Output of serial data]
96
Control procedure :When the registers are set as shown in Fig. 2.3.15, the Serial I/O 1 can transmit one-byte data
N
SIO1 (Address:1B
SIO1CON
SIOAC
P6
P6D
Initialization
IREQ1 (Address:3C
P6 (Address:0C
P6 (Address:0C
IREQ1 (Address:3C
Complete to transmit data?
simply by writing data to the Serial I/O 1 register.
Thus, after setting the CS signal to “L”, write the transmission data to the Serial I/O 1 register
on a one-byte base, and return the CS signal to “H” when the desired number of bytes have
been transmitted.
(Address:19
(Address:1A
(Address:0C
(Address:0D
RESET
16
)
1
Y
16
16
16
16
16
16
), bit7
16
), bit7
)
)
), bit7
), bit7
), bit3
a transmission
data
16
), bit3?
01001010
00000000
3819 Group USER’S MANUAL
1
0
1
1
0
2
2
0
Set the Serial I/O 1.
Set the CS signal output level to “H.”
Set the CS signal output port.
Set the CS signal output level to “L.”
Set the Serial I/O 1 interrupt request bit to “0”.
Write a transmission data.
(start to transmit 1-byte data)
Check the completion of transmitting 1-byte
data.
Use any of RAM area as a counter for
counting the number of transmitted bytes.
Check that transmission of the target num-
ber of bytes has been completed.
Return the CS signal output level to “H” when
transmission of the target number of bytes is
completed.
MITSUBISHI MICROCOMPUTER
2.3 Serial I/O
3819 Group