M30245_06 RENESAS [Renesas Technology Corp], M30245_06 Datasheet - Page 104

• Manufacturer Part Number: M30245_06
• Description: RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 2.5.8. Operation timing of transmission in serial interface special function master mode, without clock delay
Example of operation
Example of wiring
Transfer clock
Port
Transmit
enable bit (TE)
Transmit
buffer empty
flag (Tl)
CLKi
TxDi
Transmit register
empty flag
(TXEPT)
Transmit
interrupt request
bit (IR)
Shown in ( ) are bit symbols.
The above timing applies to the following settings:
• Internal clock is selected.
• CLK polarity select bit = “0”.
• Transmit interrupt cause select bit = “0”.
“H”
“L”
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
(1) Output "L" at the receiver side IC
page 95 of 354
(2) Transmission enabled
Microcomputer
Data is set to UARTi transmit buffer register
(3) Start transmission Tc
D
T
0
CLK
D
1
CLKi
T
D
Port
SSi
X
2
Di
D
3
Transferred from UARTi transmit buffer register to UARTi transmit register
D
4
D
5
D
6
Cleared to “0” when interrupt request is accepted, or cleared by software
(4) Transmission is complete
D
7
(5) Transmit next data
D
0
D
1
Tc = T
D
2
fi: frequency of BRGi count source (f
n: value set to BRGi
D
CLK
3
D
= 2(n + 1) / fi
4
D
5
D
6
Receiver side IC
SS
CLK
SR
D
7
X
2. Serial Interface Special Function
D
D
0
D
1
D
2
1
D
, f
3
8
, f
D
32
4
)
D
5
D
6
D
7