R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 412

• Manufacturer Part Number: R5F21324CNSP#U0
• Description: MCU 1KB FLASH 16K ROM 20-LSSOP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/32Cr

Specifications of R5F21324CNSP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, PWM, Voltage Detect, WDT
• Number Of I /o: 15
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-LSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/32C Group
REJ09B0573-0100 Rev.1.00 Dec. 18, 2009
Page 383 of 573
24.5
In 4-wire bus communication mode, a 4-wire bus consisting of a clock line, a data input line, a data output line, and
a chip select line is used for communication. This mode includes bidirectional mode in which the data input line
and data output line function as a single pin.
The data input line and output line change according to the settings of the MSS bit in the SSCRH register and the
BIDE bit in the SSMR2 register. For details, refer to 24.3.2.1 Association between Data I/O Pins and SS Shift
Register. In this mode, clock polarity, phase, and data settings are performed by bits CPOS and CPHS in the
SSMR register. For details, refer to 24.3.1.1 Association between Transfer Clock Polarity, Phase, and Data.
When this MCU is set as the master device, the chip select line controls output. When synchronous serial
communication unit is set as a slave device, the chip select line controls input. When it is set as the master device,
the chip select line controls output of the SCS pin or controls output of a general port according to the setting of the
CSS1 bit in the SSMR2 register. When the MCU is set as a slave device, the chip select line sets the SCS pin as an
input pin by setting bits CSS1 and CSS0 in the SSMR2 register to 01b.
In 4-wire bus communication mode, the MLS bit in the SSMR register is set to 0 and communication is performed
MSB-first.
Operation in 4-Wire Bus Communication Mode
24. Synchronous Serial Communication Unit (SSU)