R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 412

• Manufacturer Part Number: R5F21238DFP#U0
• Description: IC R8C/23 MCU FLASH 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/23r

Specifications of R5F21238DFP#U0

• Core Size: 16/32-Bit
• Program Memory Size: 64KB (64K x 8)
• Peripherals: POR, Voltage Detect, WDT
• Core Processor: R8C
• Speed: 20MHz
• Connectivity: CAN, I²C, LIN, SIO, SSU, UART/USART
• Number Of I /o: 41
• Program Memory Type: FLASH
• Ram Size: 3K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• No. Of I/o's: 41
• Ram Memory Size: 3KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• Digital Ic Case Style: LQFP
• Embedded Interface Type: CAN, I2C, UART
• Rohs Compliant: Yes
• Cpu Family: R8C
• Device Core Size: 16b
• Frequency (max): 20MHz
• Interface Type: I2C/UART
• Total Internal Ram Size: 3KB
• # I/os (max): 41
• Number Of Timers - General Purpose: 5
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 3V
• On-chip Adc: 12-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Package Type: LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: RCDK8C - KIT DEV EVAL FOR CAN R8C/23R0K521237S000BE - KIT DEV RSK R8C/23R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
18.9
Figure 18.23
18.10 Return from Bus off Function
18.11 Listen-Only Mode
When the BasicCAN bit in the C0CTLR register is set to 1, (Basic CAN mode) slots 14 and 15 correspond to
Basic CAN mode. In normal operation mode, each slot can handle only one type message at a time, either a data
frame or a remote frame by setting the C0MCTLi register (i = 0 to 15). However, in Basic CAN mode, slots 14 and
15 can receive both types of message at the same time.
When slots 14 and 15 are defined as reception slots in Basic CAN mode, received messages are stored in slots 14
and 15 alternately.
Which type of message has been received can be checked by the RemActive bit in the C0MCTLi register.
Figure 18.23 shows the Operation of Slots 14 and 15 in Basic CAN Mode.
Slot 14
Slot 15
When using Basic CAN mode, note the following points.
The CAN module can forcibly return from bus off state by setting the RetBusOff bit in the C0CTLR register to 1
(Forcible return from bus off). At the time, an error state in the CAN module transits from a bus-off state to an
error-active state. When return from bus-off is executed, the C0TECR and C0RECR registers are initialized and
the State_BusOff bit in the C0STR register is set to 0 (No bus off state). However, CAN related registers such as
the C0CONR register and contents of slots are not initialized.
When the RXOnly bit in the C0CTLR register is set to 1, the CAN module enters listen-only mode.
Listen-only mode is not allowed to transmit any frames such as error and overload frames and acknowledge. When
setting the CAN module to Listen-only mode, do not request a transmission.
(1) Basic CAN mode can only be set in CAN reset/initialization mode.
(2) Slots 14 and 15 must be set the same ID. Also, the C0LMAR and C0LMBR registers for slots 14 and 15
(3) Slots 14 and 15 must be set as reception slot.
(4) No protection against overwritten message. If any slot receives a new message while it is receiving another
(5) Slots 0 to 13 operate in normal operation mode.
Basic CAN Mode
must be set in the same way.
message, the slot may be overwritten by the new message received.
Operation of Slots 14 and 15 in Basic CAN Mode
Locked (Empty)
Empty
Msg n
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Locked (Empty)
Msg n
Msg n + 1
Locked (Msg n)
Msg n+1
Msg n + 2
Msg n + 2 (Msg n lost)
Locked (Msg n + 1)
18. CAN Module