R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 168
![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
14.1.6
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Timer RA stops counting after reset. Set the value to timer RA and timer RA prescaler before the count
starts.
Even if the prescaler and timer RA is read out in 16-bit units, these registers are read by 1 byte in the MCU.
Consequently, the timer value may be updated during the period these two registers are being read.
In pulse width measurement mode and pulse period measurement mode, the TEDGF and TUNDF bits in
the TRACR register can be set to 0 by writing 0 to these bits by a program. However, these bits remain
unchanged when 1 is written. When using the READ-MODIFY-WRITE instruction for the TRACR
register, the TEDGF or TUNDF bit may be set to 0 although these bits are set to 1 while the instruction is
executed. At the time, write 1 to the TEDGF or TUNDF bit which is not supposed to be set to 0 with the
MOV instruction.
When changing to pulse width measurement mode and pulse period measurement mode from other mode,
the contents of the TEDGF and TUNDF bits are indeterminate. Write 0 to the TEDGF and TUNDF bits
before the count starts.
The TEDGF bit may be set to 1 by timer RA prescaler underflow which is generated for the first time since
the count starts.
When using the pulse period measurement mode, leave two periods or more of timer RA prescaler
immediately after count starts, and set the TEDGF bit to 0.
The TCSTF bit retains 0 (count stops) for 0 to 1 cycle of the count source after setting the TSTART bit to 1
(count starts) while the count stops.
During this time, do not access registers associated with timer RA
starts counting at the first valid edge of the count source after The TCSTF bit is set to 1 (during count).
The TCSTF bit retains 1 for 0 to 1 cycle of the count source after setting the TSTART bit to 0 (count stops)
while the count is performing. Timer RA counting is stopped when the TCSTF bit is set to 0.
During this time, do not access registers associated with timer RA
NOTE:
When the TRAPRE register is continuously written during count operation (TCSTF bit is set to 1), allow
three or more cycles of the count source clock for each write interval.
When the TRA register is continuously written during count operation (TCSTF bit is set to 1), allow three
or more cycles of the prescaler underflow for each write interval.
Notes on Timer RA
1. Registers associated with timer RA: TRACR, TRAIOC, TRAMR, TRAPRE, TRA
Page 146 of 501
(1)
(1)
other than the TCSTF bit.
other than the TCSTF bit. Timer RA
14. Timers
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