R5F21334CNFP#U0 Renesas Electronics America, R5F21334CNFP#U0 Datasheet - Page 453

• Manufacturer Part Number: R5F21334CNFP#U0
• Description: MCU 1KB FLASH 16K ROM 32-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/33Cr

Specifications of R5F21334CNFP#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: 27
• 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 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/33C Group
REJ09B0570-0100 Rev.1.00 Dec. 14, 2009
Page 423 of 589
25.4.3
In master receive mode, the master device outputs the receive clock, receives data from the slave device, and
returns an acknowledge signal.
Figures 25.7 and 25.8 show the Operating Timing in Master Receive Mode (I
The receive procedure and operation in master receive mode are shown below.
(1) After setting the TEND bit in the ICSR register to 0, set the TRS bit in the ICCR1 register to 0 to switch
(2) Dummy reading the ICDRR register starts receive operation. The receive clock is output in synchronization
(3) When 1-frame of data reception is completed, the RDRF bit in the ICSR register is set to 1 at the rising
(4) Continuous receive operation is enabled by reading the ICDRR register every time the RDRF bit is set to 1.
(5) If the next frame is the last receive frame and the RCVD bit in the ICCR1 register is set to 1 (next receive
(6) When the RDRF bit is set to 1 at the rising edge of the 9th clock cycle of the receive clock, generate a stop
(7) When the STOP bit in the ICSR register is set to 1, read the ICDRR register and set the RCVD bit to 0 (next
(8) Return to slave receive mode.
from master transmit mode to master receive mode. Then set the TDRE bit in the ICSR register to 0.
with the internal clock and data is received. The master device outputs the level set by the ACKBT bit in
the ICIER register to the SDA pin at the rising edge of the 9th clock cycle of the receive clock.
edge of the 9th clock cycle of the receive clock. At this time, if the ICDRR register is read, the received
data can be read and the RDRF bit is set to 0 simultaneously.
If reading the ICDRR register is delayed by another process and the 8th clock cycle falls while the RDRF
bit is set to 1, the SCL signal is fixed “L” until the ICDRR register is read.
operation disabled) before reading the ICDRR register, stop condition generation is enabled after the next
receive operation.
condition.
receive operation continues).
Master Receive Operation
2
C bus Interface Mode).
25. I
2
C bus Interface