r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 499

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
21.2.10 SI Mode Register 2 (SIMR2)
Notes:
21.2.10.1 SSU Function
After Reset
1. Refer to 21.3.1.3 Association between Data I/O Pins and SS Shift Register for information on combinations of
2. When using 4-wire bus communication mode, always use the SCS pin as N-channel open-drain output.
3. When the SCS pin is used as CMOS output, a conflict error may occur when SCS output is enabled. After the
4. Set bits CSOS, SOOS, and SCKOS to 0 (CMOS output) when this module is not used.
5. Do not set bits CSOS, CSS0, and CSS1 simultaneously. When the SCS pin is selected, first set the CSOS bit
6. When the SOOS bit is 0, set the port direction register bits corresponding to pins SSI and SSO to 0 (input mode).
7. Do not set bits SCKOS and SCKS simultaneously. When the SSCK pin is selected, set the SCKOS bit before
8. When the MS bit is 0 (clock synchronous communication mode), the SCS pin functions as a port regardless of
9. This bit functions as the SCS input pin before transfer starts.
10.The BIDE bit is disabled when the MS bit is 0 (clock synchronous communication mode).
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 000EBh (SIMR2_0)
In the SIMR2 register, the bit functions differ depending on the SSU function and the I
data I/O pins.
error flag is cleared, set to master mode again to continue communication.
and then set bits CSS1 and CSS0 to 01b, 10b, or 11b. When the SCS pin is not selected, first set bits CSS1 and
CSS0 to 00b and then set the CSOS bit.
setting the SCKS bit to 1 (functions as the serial clock pin). When the SSCK pin is not selected, set the SCKS bit
to 0 (function as a port) before setting the SCKOS bit.
the content of bits CSS0 and CSS1.
Symbol
SCKOS SSCK pin open-drain output select bit
Symbol
CSOS
SOOS
Bit
SCKS
CSS0
CSS1
BIDE
MS
Preliminary document
Specifications in this document are tentative and subject to change.
BIDE
b7
0
Mode select bit
SCS pin open-drain output select bit
(2, 3, 4, 5)
Serial data open-drain output select bit
(1, 4)
(4, 7)
SCS pin select bits
SSCK pin select bit
Bidirectional mode enable bit
SCKS
b6
0
(1)
Bit Name
CSS1
(5, 8)
b5
(7)
0
CSS0
(1, 10)
b4
0
SCKOS
b3
0
0: Clock synchronous communication mode
1: 4-wire bus communication mode
0: CMOS output
1: N-channel open-drain output
0: CMOS output
1: N-channel open-drain output
0: CMOS output
1: N-channel open-drain output
0: Functions as a port
1: Functions as the serial clock pin
0: Standard mode (communication using two
1: Bidirectional mode (communication using
b5 b4
0 0: Functions as a port
0 1: Functions as the SCS input pin
1 0: Functions as the SCS output pin
1 1: Functions as the SCS output pin
pins for data input and data output)
one pin for data input and data output)
SOOS
b2
0
21. Clock Synchronous Serial Interface
(6)
CSOS
Function
b1
0
MS
2
b0
0
C bus function.
(9)
(9)
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