h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 518

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

Section 16 I
DDCSWR
Bit 6
SW
0
1
Note:
16.2.3
SARX is an 8-bit readable/writable register that stores the second slave address and selects the
communication format. When the chip is in slave mode (and the addressing format is selected), if
the upper 7 bits of SARX match the upper 7 bits of the first frame received after a start condition,
the chip operates as the slave device specified by the master device. SARX is assigned to the same
address as ICDR, and can be written and read only when the ICE bit is cleared to 0 in ICCR.
SARX is initialized to H'01 by a reset and in hardware standby mode.
Rev. 4.00 Jun 06, 2006 page 464 of 1004
REJ09B0301-0400
Bit
Initial value
Read/Write
* Do not set this mode when automatic switching to the I
Second Slave Address Register (SARX)
means of the DDCSWR setting.
SAR
Bit 0
FS
0
1
0
0
1
1
2
C Bus Interface [H8S/2138 Group Option]
SVAX6
R/W
7
0
SARX
Bit 0
FSX
0
1
0
1
0
1
0
1
SVAX5
R/W
6
0
SVAX4
Operating Mode
I
I
I
Synchronous serial format
Formatless mode (start/stop conditions not detected)
Formatless mode * (start/stop conditions not detected)
2
2
2
R/W
C bus format
C bus format
C bus format
5
0
SAR and SARX slave addresses recognized
SAR slave address recognized
SARX slave address ignored
SAR slave address ignored
SARX slave address recognized
SAR and SARX slave addresses ignored
Acknowledge bit used
No acknowledge bit
SVAX3
R/W
4
0
SVAX2
R/W
3
0
2
C bus format is performed by
SVAX1
R/W
2
0
SVAX0
R/W
1
0
(Initial value)
FSX
R/W
0
1