Datasheet

Section 18 I
2
C Bus Interface [Option]
(This function is not available in the H8S/2695)
R01UH0166EJ0600 Rev. 6.00 Page 837 of 1434
Mar 02, 2011
H8S/2633 Group, H8S/2633 F-ZTAT
TM
,
H8S/2633R F-ZTAT
TM
, H8S/2695
Section 18 I
2
C Bus Interface [Option]
(This function is not available in the H8S/2695)
A two-channel I
2
C bus interface is available as an option in the H8S/2633 Group. The I
2
C bus
interface is not available for the H8S/2633 Group. Observe the following notes when using this
option.
1. For mask-ROM versions, a W is added to the part number in products in which this optional
function is used.
Examples: HD6432633WF
2. The product number is identical for F-ZTAT versions. However, be sure to inform your
Renesas sales representative if you will be using this option.
18.1 Overview
A two-channel I
2
C bus interface is available for the H8S/2633 Group as an option. The I
2
C bus
interface conforms to and provides a subset of the Philips I
2
C bus (inter-IC bus) interface
functions. The register configuration that controls the I
2
C bus differs partly from the Philips
configuration, however.
Each I
2
C bus interface channel uses only one data line (SDA) and one clock line (SCL) to transfer
data, saving board and connector space.
18.1.1 Features
• Selection of addressing format or non-addressing format
⎯ I
2
C bus format: addressing format with acknowledge bit, for master/slave operation
⎯ Serial format: non-addressing format without acknowledge bit, for master operation only
• Conforms to Philips I
2
C bus interface (I
2
C bus format)
• Two ways of setting slave address (I
2
C bus format)
• Start and stop conditions generated automatically in master mode (I
2
C bus format)
• Selection of acknowledge output levels when receiving (I
2
C bus format)
• Automatic loading of acknowledge bit when transmitting (I
2
C bus format)
• Wait function in master mode (I
2
C bus format)
A wait can be inserted by driving the SCL pin low after data transfer, excluding
acknowledgement. The wait can be cleared by clearing the interrupt flag.