R5F21294SNSP#U0 Renesas Electronics America, R5F21294SNSP#U0 Datasheet - Page 323

• Manufacturer Part Number: R5F21294SNSP#U0
• Description: MCU 3/5V 16K+2K 20PIN-SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/29r

Specifications of R5F21294SNSP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/28 Group, R8C/29 Group
Rev.2.10
REJ09B0279-0210
Figure 16.41
16.3.4.2
ICDRT register
ICDRS register
ICCR1 register
ICSR register
by program
In transmit mode, transmit data is output from the SDA pin in synchronization with the falling edge of the
transfer clock. The transfer clock is output when the MST bit in the ICCR1 register is set to 1 and input when
the MST bit is set to 0.
Figure 16.41 shows the Operating Timing in Transmit Mode (Clock Synchronous Serial Mode).
The transmit procedure and operation in transmit mode are as follows.
Processing
TDRE bit in
TRS bit in
(1) Set the ICE bit in the ICCR1 register to 1 (transfer operation enabled). Set bits CKS0 to CKS3 in the
(2) The TDRE bit in the ICSR register is set to 1 by selecting transmit mode after setting the TRS bit in the
(3) Data is transferred from registers ICDRT to ICDRS and the TDRE bit is automatically set to 1 by
(output)
Sep 26, 2008
SDA
SCL
ICCR1 register and set the MST bit (initial setting).
ICCR1 register to 1.
writing transmit data to the ICDRT register after confirming that the TDRE bit is set to 1. Continuous
transmission is enabled by writing data to the ICDRT register every time the TDRE bit is set to 1. When
switching from transmit to receive mode, set the TRS bit to 0 while the TDRE bit is set to 1.
(2) Set TRS bit to 1
Transmit Operation
Operating Timing in Transmit Mode (Clock Synchronous Serial Mode)
1
0
1
0
(3) Data write to
ICDRT register
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Data 1
b0
Data 1
1
b1
(3) Data write to
2
ICDRT register
b6
Data 2
7
b7
8
b0
Data 2
1
16. Clock Synchronous Serial Interface
(3) Data write to
b6
ICDRT register
7
b7
8
(3) Data write to
Data 3
Data 3
ICDRT register
b0
1