R5F21237DFP#U0 Renesas Electronics America, R5F21237DFP#U0 Datasheet - Page 157
![IC R8C/23 MCU FLASH 48-LQFP](/photos/12/18/121887/r5f21237dfp_u0_sml.jpg)
R5F21237DFP#U0
Manufacturer Part Number
R5F21237DFP#U0
Description
IC R8C/23 MCU FLASH 48-LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/23r
Specifications of R5F21237DFP#U0
Core Processor
R8C
Core Size
16/32-Bit
Speed
20MHz
Connectivity
CAN, I²C, LIN, SIO, SSU, UART/USART
Peripherals
POR, Voltage Detect, WDT
Number Of I /o
41
Program Memory Size
48KB (48K x 8)
Program Memory Type
FLASH
Ram Size
2.5K 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
For Use With
RCDK8C - KIT DEV EVAL FOR CAN R8C/23R0K521237S000BE - KIT DEV RSK R8C/23R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
Figure 14.6
14.1.1.1
The above applies under the following conditions.
Both bits TSTART and TCSTF in the TRACR register are set to 1 (During count).
Timer RA has a prescaler and a timer (which counts the prescaler underflows). The prescaler and timer each
consist of a reload register and a counter. When writing to the prescaler or timer, values are written to both the
reload register and counter.
However, values are transferred from the reload register to the counter of the prescaler in synchronization with
the count source. In addition, values are transferred from the reload register to the counter of the timer in
synchronization with prescaler underflows. Therefore, if the prescaler or timer is written to when count
operation is in progress, the counter value is not updated immediately after the WRITE instruction is executed.
Figure 14.6 shows an Operating Example of Timer RA when Counter Value is Rewritten during Count
Operation.
Counter of timer RA
Reloads register of
Reloads register of
timer RA prescaler
timer RA prescaler
IR bit in TRAIC
Count source
Set 01h to the TRAPRE register and 25h to
the TRA register by a program.
Counter of
timer RA
register
Timer Write Control during Count Operation
Operation
Operating Example of Timer RA when Counter Value is Rewritten during Count
0
Page 135 of 501
Previous value
06h
05h
Previous value
The IR bit remains unchanged until underflow is
generated by a new value.
After writing, the reload register is
written to at the first count source.
03h
04h
01h
Reload at
second count
source
00h
After writing, the reload register is
written to at the first underflow.
01h
Reload at
underflow
02h
New value (01h)
00h
Reload at the second underflow
01h
25h
New value (25h)
00h
01h
24h
00h
14. Timers
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