R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 144
![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
12.7.5
Sample programs 1 to 3 are preventing the I flag from being set to 1 (interrupt enables) before changing the
interrupt control register for reasons of the internal bus or the instruction queue buffer.
Example 1: Use NOP instructions to prevent I flag being set to 1 before interrupt control register is
Example 2: Use dummy read to have FSET instruction wait
Example 3: Use POPC instruction to change I flag
(a) Each interrupt control register can only be changed while interrupt requests corresponding to that
(b) When changing any interrupt control register after disabling interrupts, be careful with the instructions
(c) When disabling interrupts using the I flag, set the I flag according to the following sample programs.
INT_SWITCH1:
INT_SWITCH2:
INT_SWITCH3:
Changing Interrupt Control Register Contents
FCLR
AND.B
MOV.W
FSET
PUSHC
FCLR
AND.B
POPC
FCLR
AND.B
NOP
NOP
FSET
register are not generated. If interrupt requests may be generated, disable the interrupts before changing
the interrupt control register.
to be used.
When changing any bit other than IR bit
If an interrupt request corresponding to that register is generated while executing the instruction, the IR
bit may not be set to 1 (interrupt requested), and the interrupt request may be ignored. If this causes a
problem, use the following instructions to change the register.
Instructions to use: AND, OR, BCLR, BSET
When changing IR bit
If the IR bit is set to 0 (interrupt not requested), it may not be set to 0 depending on the instruction to be
used. Therefore, use the MOV instruction to set the IR bit to 0.
Refer to (b) for the change of interrupt control registers in the sample programs.
changed
I
I
I
I
I
FLG
#00H,0056H
#00H,0056H
MEM,R0
FLG
#00H,0056H
Page 122 of 501
; Disable interrupts
; Set TRAIC register to 00h
;
; Enable interrupts
; Disable interrupts
; Set TRAIC register to 00h
; Dummy read
; Enable interrupts
; Disable interrupts
; Set TRAIC register to 00h
; Enable interrupts
12. Interrupts
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