h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 552

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

Section 16 I
16.3.7
Setting the SW bit to 1 in DDCSWR enables formatless mode to be selected as the IIC0 operating
mode. Switching from formatless mode to the I
automatically when a falling edge is detected on the SCL pin.
The following four preconditions are necessary for this operation:
Automatic switching is performed from formatless mode to the I
DDCSWR is automatically cleared to 0 on detection of a falling edge on the SCL pin. Switching
from the I
DDCSWR to 1.
In formatless mode, bits (such as MSL and TRS) that control the I
must not be modified. When switching from the I
bit to 1 or clear it to 0 according to the transmit data (transmission or reception) in formatless
mode, then set the SW bit to 1. After automatic switching from formatless mode to the I
format (slave mode), in order to wait for slave address reception, the TRS bit is automatically
cleared to 0.
If a falling edge is detected on the SCL pin during formatless operation, I
operating mode is switched to the I
detected.
Rev. 4.00 Jun 06, 2006 page 498 of 1004
REJ09B0301-0400
A common data pin (SDA) for formatless and I
Separate clock pins for formatless operation (VSYNCI) and I
A fixed 1 level for the SCL pin during formatless operation (the SCL pin does not output a low
level)
Settings of bits other than TRS in ICCR that allow I
Automatic Switching from Formatless Mode to I
2
C bus format to formatless mode is achieved by having software set the SW bit in
2
C Bus Interface [H8S/2138 Group Option]
2
C bus format without waiting for a stop condition to be
2
C bus format (slave mode) is performed
2
C bus format to formatless mode, set the TRS
2
C bus format operation
2
C bus format operation
2
C Bus Format
2
2
C bus format when the SW bit in
C bus format operation (SCL)
2
C bus interface operating mode
2
C bus interface
2
C bus