h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 550

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 16 I
16.3.6
The interrupt request flag (IRIC) is set at different times depending on the WAIT bit in ICMR, the
FS bit in SAR, and the FSX bit in SARX. If the TDRE or RDRF internal flag is set to 1, SCL is
automatically held low after one frame has been transferred; this timing is synchronized with the
internal clock. Figure 16.12 shows the IRIC set timing and SCL control.
Rev. 4.00 Jun 06, 2006 page 496 of 1004
REJ09B0301-0400
SCL
(master output)
SCL
(slave output)
SDA
(slave output)
SDA
(master output)
TDRE
IRIC
ICDRT
ICDRS
User processing
Figure 16.11 Example of Slave Transmit Mode Operation Timing (MLS = 0)
IRIC Setting Timing and SCL Control
Slave receive mode Slave transmit mode
2
C Bus Interface [H8S/2138 Group Option]
R/W
8
[3] IRIC
clearance
Interrupt
request
generation
[2]
A
9
[3] ICDR write
Data 1
Bit 7
Interrupt
request
generation
Data 1
1
Bit 6
2
[3] ICDR write
Bit 5
3
Bit 4
Data 1
Data 2
4
Bit 3
5
Bit 2
6
Bit 1
7
Bit 0
[5] IRIC
8
clear
9
Interrupt
request
generation
A
[3]
Data 2
Bit 7
[5] ICDR write
1
Data 2
Bit 6
2