R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 96

• 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
Figure 10.3
System Clock Control Register 1
b7 b6 b5 b4 b3 b2 b1
NOTES:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Set the PRC0 bit in the PRCR register to 1 (enables w riting) before rew riting to the CM1 register.
When entering stop mode, the CM15 bit is set to 1 (drive capacity high).
When the CM06 bit is set to 0 (CM16, CM17 bits enabled), the CM16 to CM17 bits become enabled.
If the CM10 bit is 1 (stop mode), the internal feedback resistor becomes disabled.
When the OCD2 bit is set to 0 (selects XIN clock), the CM14 bit is set to 1 (stops low -speed on-chip oscillator). When
the OCD2 bit is set to 1 (selects on-chip oscillator clock), the CM14 bit is set to 0 (low -speed on-chip oscillator on). It
remains unchanged even if it is set to 1.
When using the low voltage 2 detection interrupt (w hen using the digital filter), set the CM14 bit to 0 (low -speed on-
chip oscillator on).
When the CM10 bit is set to 1 (stop mode) and the CM13 bit is set to 1 (XIN-XOUT pin), the XOUT
(P4_7) pin becomes “H”. When the CM13 bit is set to 0 (input ports, P4_6, P4_7), the P4_7 (XOUT) enters
input mode.
In count source protect mode (Refer to 13.2 Count Source Protection Mode Enabled), the value remains
unchanged even if the CM10 and CM14 bits are set.
Once the CM13 bit is set to 1, it can not to 0 in a program.
0 0
CM1 Register
b0
Bit Symbol
(b2-b1)
Symbol
CM10
CM13
CM14
CM15
CM16
CM17
Page 74 of 501
CM1
—
All clock stop control bit
Reserved bits
Port XIN-XOUT sw itch bit
Low -speed on-chip oscillation stop
bit
XIN-XOUT drive capacity select bit
System clock division select bits 1
(1)
(5,6,8)
Address
Bit Name
0007h
(4,7,8)
(7,9)
(3)
(2)
b7 b6
0 0 : No division mode
0 1 : Divide-by-2 mode
1 0 : Divide-by-4 mode
1 1 : Divide-by-16 mode
0 : Oscillates clock
1 : Stops all clocks (stop mode)
Set to 0
0 : Input ports P4_6, P4_7
1 : XIN-XOUT pin
0 : Low -speed on-chip oscillator on
1 : Low -speed on-chip oscillator off
0 : Low
1 : High
After Reset
00100000b
Function
10. Clock Generation Circuit
RW
RW
RW
RW
RW
RW
RW
RW