h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 378
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h8s-2111b
Manufacturer Part Number
h8s-2111b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2111B.pdf
(582 pages)
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11. Note on ICDR read and ICCR access in slave transmit mode
Note: This restriction on usage can be canceled by setting the FNC1 and FNC0 bits to 1 in
Rev. 1.00, 05/04, page 344 of 544
In I
during the time shaded in figure 13.33. However, such read and write operations cause no
problem in interrupt handling processing that is generated in synchronization with the rising
edge of the 9th clock pulse because the shaded time has passed before making the transition to
interrupt handling.
To handle interrupts securely, be sure to keep either of the following conditions.
Read ICDR data that has been received so far or read/write from/to ICCR before starting
Monitor the BC2 to BC0 bit counter in ICMR; when the count is 000 (8th or 9th clock
2
the receive operation of the next slave address.
pulse), wait for at least two transfer clock times in order to read ICDR or read/write from/to
ICCR during the time other than the shaded time.
C bus interface slave transmit mode, do not read ICDR or do not read/write from/to ICCR
ICXR.
Figure 13.33 ICDR Read and ICCR Access Timing in Slave Transmit Mode
TRS bit
SDA
SCL
Address reception
R/W
8
The rise of the 9th clock is detected
Waveform at problem occurrence
A
9
ICDR read and ICCR read/write are disabled
(6 system clock period)
ICDR write
Data transmission
Bit 7
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