R5F21275SNFP#U0 Renesas Electronics America, R5F21275SNFP#U0 Datasheet - Page 458
R5F21275SNFP#U0
Manufacturer Part Number
R5F21275SNFP#U0
Description
IC R8C/27 MCU FLASH 32LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/27r
Datasheet
1.R5F21272SDFPU0.pdf
(487 pages)
Specifications of R5F21275SNFP#U0
Core Processor
R8C
Core Size
16/32-Bit
Speed
20MHz
Connectivity
I²C, LIN, SIO, SSU, UART/USART
Peripherals
LED, POR, Voltage Detect, WDT
Number Of I /o
25
Program Memory Size
24KB (24K x 8)
Program Memory Type
FLASH
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
2.2 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 85°C
Package / Case
32-LQFP
For Use With
R0K521276S000BE - KIT DEV RSK-R8C/26-29R0E521000EPB00 - PROBE EMULATOR FOR PC7501
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Part Number:
R5F21275SNFP#U0R5F21275SNFP#V2
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Part Number:
R5F21275SNFP#U0R5F21275SNFP#X6
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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R8C/26 Group, R8C/27 Group
Rev.2.10
REJ09B0278-0210
21.3.4.3
In real-time clock mode, read registers TRESEC, TREMIN, TREHR, and TREWK when time data is updated
and read the PM bit in the TRECR1 register when the BSY bit is set to 0 (not while data is updated).
Also, when reading several registers, an incorrect time will be read if data is updated before another register is
read after reading any register.
In order to prevent this, use the reading procedure shown below.
• Using an interrupt
• Monitoring with a program 1
• Monitoring with a program 2
(1) Monitor the BSY bit.
(2) Monitor until the BSY bit is set to 0 after the BSY bit is set to 1 (approximately 62.5 ms while the BSY
(3) Read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the
• Using read results if they are the same value twice
(1) Read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the
(2) Read the same register as (1) and compare the contents.
(3) Recognize as the correct value if the contents match. If the contents do not match, repeat until the read
Sep 26, 2008
Read necessary contents of registers TRESEC, TREMIN, TREHR, and TREWK and the PM bit in the
TRECR1 register in the timer RE interrupt routine.
Monitor the IR bit in the TREIC register with a program and read necessary contents of registers TRESEC,
TREMIN, TREHR, and TREWK and the PM bit in the TRECR1 register after the IR bit in the TREIC
register is set to 1 (timer RE interrupt request generated).
Also, when reading several registers, read them as continuously as possible.
bit is set to 1).
TRECR1 register after the BSY bit is set to 0.
TRECR1 register.
contents match with the previous contents.
Time Reading Procedure of Real-Time Clock Mode
Page 439 of 453
21. Usage Notes
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