R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 400

• 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 371 of 573
24.3
24.3.1
24.3.1.1
The transfer clock can be selected from among seven internal clocks (f1/256, f1/128, f1/64, f1/32, f1/16, f1/8,
and f1/4) and an external clock.
When using synchronous serial communication unit, set the SCKS bit in the SSMR2 register to 1 and select the
SSCK pin as the serial clock pin.
When the MSS bit in the SSCRH register is set to 1 (operates as master device), an internal clock can be
selected and the SSCK pin functions as output. When transfer is started, the SSCK pin outputs clocks of the
transfer rate selected by bits CKS0 to CKS2 in the SSCRH register.
When the MSS bit in the SSCRH register is set to 0 (operates as slave device), an external clock can be selected
and the SSCK pin functions as input.
The association between the transfer clock polarity, phase and data changes according to the combination of the
SSUMS bit in the SSMR2 register and bits CPHS and CPOS in the SSMR register.
Figure 24.2 shows the Association between Transfer Clock Polarity, Phase, and Transfer Data.
Also, the MSB-first transfer or LSB-first transfer can be selected by setting the MLS bit in the SSMR register.
When the MLS bit is set to 1, transfer is started from the LSB and proceeds to the MSB. When the MLS bit is
set to 0, transfer is started from the MSB and proceeds to the LSB.
Common Items for Multiple Modes
Transfer Clock
Association between Transfer Clock Polarity, Phase, and Data
24. Synchronous Serial Communication Unit (SSU)