Datasheet

Section 18 I
2
C Bus Interface [Option]
(This function is not available in the H8S/2695)
Page 844 of 1434 R01UH0166EJ0600 Rev. 6.00
Mar 02, 2011
H8S/2633 Group, H8S/2633 F-ZTAT
TM
,
H8S/2633R F-ZTAT
TM
, H8S/2695
TDRE Description
0 The next transmit data is in ICDR (ICDRT), or transmission cannot (Initial value)
be started
[Clearing conditions]
• When transmit data is written in ICDR (ICDRT) in transmit mode (TRS = 1)
• When a stop condition is detected in the bus line state after a stop condition is
issued with the I
2
C bus format or serial format selected
• When a stop condition is detected with the I
2
C bus format selected
• In receive mode (TRS = 0)
(A 0 write to TRS during transfer is valid after reception of a frame containing an
acknowledge bit)
1 The next transmit data can be written in ICDR (ICDRT)
[Setting conditions]
• In transmit mode (TRS = 1), when a start condition is detected in the bus line state
after a start condition is issued in master mode with the I
2
C bus format or serial
format selected
• When using formatless mode in transmit mode (TRS = 1)
• When data is transferred from ICDRT to ICDRS
(Data transfer from ICDRT to ICDRS when TRS = 1 and TDRE = 0, and ICDRS is
empty)
• When a switch is made from receive mode (TRS = 0) to transmit mode (TRS = 1 )
after detection of a start condition
RDRF Description
0 The data in ICDR (ICDRR) is invalid (Initial value)
[Clearing condition]
When ICDR (ICDRR) receive data is read in receive mode
1 The ICDR (ICDRR) receive data can be read
[Setting condition]
When data is transferred from ICDRS to ICDRR
(Data transfer from ICDRS to ICDRR in case of normal termination with TRS = 0 and
RDRF = 0)