R5F21324ANSP#U1 Renesas Electronics America, R5F21324ANSP#U1 Datasheet - Page 359

• Manufacturer Part Number: R5F21324ANSP#U1
• Description: MCU 1KB FLASH 16K ROM 20-LSSOP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/32Ar

Specifications of R5F21324ANSP#U1

• 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: -

Under development
R8C/32A Group
REJ09B0458-0020 Rev.0.20
Page 329 of 583
Figure 22.4
22.3.1
22.3.2
If a communication error occurs while transmitting or receiving in clock synchronous serial I/O mode, follow
the procedures below:
• Resetting the U2RB register
(1) Set the RE bit in the U2C1 register to 0 (reception disabled).
(2) Set bits SMD2 to SMD0 in the U2MR register to 000b (serial interface disabled).
(3) Set bits SMD2 to SMD0 in the U2MR register to 001b (clock synchronous serial I/O mode).
(4) Set the RE bit in the U2C1 register to 1 (reception enabled).
• Resetting the U2TB register
(1) Set bits SMD2 to SMD0 in the U2MR register to 000b (serial interface disabled).
(2) Set bits SMD2 to SMD0 in the U2MR register to 001b (clock synchronous serial I/O mode).
(3) Write 1 to the TE bit in the U2C1 register (transmission enabled), regardless of the TE bit value in the
Use the CKPOL bit in the U2C0 register to select the transfer clock polarity. Figure 22.4 shows the Transfer
Clock Polarity.
(1) CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge and
(2) CKPOL bit in U2C0 register = 1 (transmit data output at the rising edge and
U2C2 register.
CLK2
TXD2
RXD2
CLK2
TXD2
RXD2
The above applies when:
Measure for Dealing with Communication Errors
CLK Polarity Select Function
•
•
receive data input at the rising edge of the transfer clock)
receive data input at the falling edge of the transfer clock)
UFORM bit in U2C0 register = 0 (LSB first)
U2LCH bit in U2C1 register = 0 (not inverted)
Preliminary specification
Specifications in this manual are tentative and subject to change.
Transfer Clock Polarity
D0
D0
D0
D0
Nov 05, 2008
D1
D1
D1
D1
D2
D2
D2
D2
D3
D3
D3
D3
D4
D4
D4
D4
D5
D5
D5
D5
D6
D6
D6
D6
D7
D7
D7
D7
“H” output from CLK2 pin
“L” output from CLK2 pin
during no transfer
during no transfer
22. Serial Interface (UART2)