r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 504

• 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
Table 21.8
—: Used as a programmable I/O port.
MS, BIDE: Bits in SIMR2 register
MST: Bit in SICR1 register
TE_NAKIE, RE_STIE: Bits in SIER register
Note:
Clock synchronous
communication
mode
4-wire bus
communication
mode
4-wire bus
(bidirectional)
communication
mode
21.3.1.5
Communication
1. Do not set both the TE_NAKIE and RE_STIE bits to 1 in 4-wire bus (bidirectional) communication mode.
Note that bits TDRE and TEND in the SISR register are automatically set to 0 by writing transmit data to the
SITDR register and the RDRF bit in the SISR register is automatically set to 0 by reading the SIRDR register. In
particular, the TDRE bit is set back to 1 (data is transferred from registers SITDR to SISDR) at the same time
transmit data is written to the SITDR register. If the TDRE bit is set to 0 (data is not transferred from registers
SITDR to SISDR) by any method other than the above (register access by software), an additional 1 byte of
transferred data may be transmitted.
The synchronous serial communication unit switches the functions of the I/O pins in each communication mode
according to the settings of the MST bit in the SICR1 register and bits RE_STIE and TE_NAKIE in the SIER
register. Table 21.8 lists the Association between Communication Modes and I/O Pins.
(1)
Mode
Preliminary document
Specifications in this document are tentative and subject to change.
Communication Modes and Pin Functions
Association between Communication Modes and I/O Pins
MS
0
1
1
Disabled
BIDE
0
1
Bit Setting
MST
0
1
0
1
0
1
TE_NAKIE
0
1
0
1
0
1
0
1
0
1
0
1
RE_STIE
21. Clock Synchronous Serial Interface
1
0
1
1
0
1
1
0
1
1
0
1
1
0
1
0
Output
Output
Input
Input
Input
Input
Input
Input
SSI
—
—
—
—
—
—
—
—
Pin State
Output
Output
Output
Output
Output
Output
Output
Output
Input
Input
Input
Input
SSO
—
—
—
—
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Output
Output
Output
Output
Output
Output
Output
Output
SSCK
Input
Input
Input
Input
Input
Input
Input
Input