R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 106
![IC R8C/23 MCU FLASH 48-LQFP](/photos/12/38/123822/r5f21238dfp_u0_sml.jpg)
R5F21238DFP#U0
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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- Download datasheet (6Mb)
R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
10.4.2
10.4.1.3
10.4.2.1
10.4.2.2
10.4.2.3
If the CM14 bit in the CM1 register is set to 0 (low-speed on-chip oscillator on) or the FRA01bit in the FRA0
register is set to 0, the low-speed on-chip oscillator provides the on-chip oscillator clock.
The on-chip oscillator clock divided-by-1 (no division), -2, -4, -8 or -16 provides the CPU clock. The on-chip
oscillator clock is also the clock source for the peripheral function clocks. Set the CM06 bit to 1 (divide-by-8
mode) when transiting to high-speed clock mode. When the FRA00 bit is set to 1, fOCO40M can be used for
timer RD. When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the
watchdog timer and voltage detection circuit.
In this mode, stopping the XIN clock and high-speed on-chip oscillator, and setting the FMR47 bit in the
FMR4 register to 1 (flash memory low consumption current read mode enabled) enables low consumption
operation.
To enter wait mode from low-speed on-chip oscillator mode, setting the VCA20 bit in the VCA2 register to 1
(internal power low consumption enabled) enables lower consumption current in wait mode.
When enabling reduced internal power consumption using the VCA20 bit, follow Figure 10.11 Procedure for
Enabling Reduced Internal Power Consumption Using VCA20 bit.
Since the CPU clock stops in wait mode, the CPU operated in the CPU clock and the watchdog timer when
count source protection mode is disabled stops. The XIN clock and on-chip oscillator clock do not stop and the
peripheral functions using these clocks maintain operating.
If the CM02 bit is set to 1 (peripheral function clock stops in wait mode), the f1, f2, f4, f8, f32, and fCAN0
clocks stop in wait mode. The power consumption can be reduced.
The MCU enters wait mode when the WAIT instruction is executed.
When the OCD2 bit in the OCD register is set to 1 (on-chip oscillator selected as system clock), set the
OCD1bit in the OCD register to 0 (oscillation stop detection interrupt disabled) before executing the WAIT
instruction.
If the MCU enters wait mode while the OCD1 bit is set to 1 (oscillation stop detection interrupt enabled),
current consumption is not reduced because the CPU clock does not stop.
The I/O port is the status before wait mode was entered is maintained.
Wait Mode
Low-Speed On-Chip Oscillator Mode
Peripheral Function Clock Stop Function
Entering Wait Mode
Pin Status in Wait Mode
Page 84 of 501
10. Clock Generation Circuit
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