Section 18
I
2
C Bus Interface (IIC)
Rev. 1.00 Mar. 12, 2008 Page 613 of 1178
REJ09B0403-0100
Bit Bit
Name
Initial
Value
R/W Description
4
ICDRE
0
R
Transmit Data Write Request Flag
Indicates the ICDR (ICDRT) status in transmit mode.
0: Indicates that the data has been already written to ICDR
(ICDRT) or ICDR is initialized.
1: Indicates that data has been transferred from ICDRT to
ICDRS and is being transmitted, or the start condition
has been detected or transmission has been completed,
thus allowing the next data to be written to.
[Setting conditions]
•
When the start condition is detected from the bus line
state in I
2
C bus format or serial format.
•
When data is transferred from ICDRT to ICDRS.
1. When data is transmitted completely while ICDRE
= 0 (at the rise of the 9th clock pulse).
2. When data is written to ICDR completely in transmit
mode after data was transmitted while ICDRE = 1.
[Clearing conditions]
•
When data is written to ICDR (ICDRT).
•
When the stop condition is detected in I
2
C bus format
or serial format.
•
When 0 is written to the ICE bit.
Note that if the ACKE bit is set to 1 in I
2
C bus format thus
enabling acknowledge bit decision, ICDRE is not set when
data is transmitted completely while the acknowledge bit is
1.
When ICDRE is set due to the condition (2) above, ICDRE
is temporarily cleared to 0 when data is written to ICDR
(ICDRT); however, since data is transferred from ICDRT to
ICDRS immediately, ICDRF is set to 1 again. Do not write
data to ICDR when TRS = 0 because the ICDRE flag
value is invalid during the time.
Summary of Contents for H8S Family
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Page 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Page 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Page 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
Page 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Page 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Page 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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Page 1230: ...H8S 2472 Group H8S 2462 Group Hardware Manual...