R5F21257SYFP#U0 Renesas Electronics America, R5F21257SYFP#U0 Datasheet - Page 290
![MCU 2KB FLASH 48K 52-LQFP](/photos/28/61/286101/52-lqfp_sml.jpg)
R5F21257SYFP#U0
Manufacturer Part Number
R5F21257SYFP#U0
Description
MCU 2KB FLASH 48K 52-LQFP
Manufacturer
Renesas Electronics America
Series
R8C/2x/25r
Specifications of R5F21257SYFP#U0
Core Processor
R8C
Core Size
16/32-Bit
Speed
20MHz
Connectivity
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)
2.2 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 105°C
Package / Case
52-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Manufacturer
Quantity
Price
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R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
Figure 14.113 Block Diagram of Real-Time Clock Mode
14.4.1
In real-time clock mode, a 1-second signal is generated from fC4 using a divide-by-2 frequency divider, 4-bit
counter, and 8-bit counter and used to count seconds, minutes, hours, and days of the week. Figure 14.113
shows a Block Diagram of Real-Time Clock Mode and Table 14.37 lists the Real-Time Clock Mode
Specifications. Figures 14.114 to 14.118, and Figures 14.120 and 14.121 show the Registers Associated with
Real-Time Clock Mode. Table 14.38 lists the Interrupt Sources, Figure 14.119 shows the Definition of Time
Representation and Figure 14.122 shows the Operating Example in Real-Time Clock Mode.
H12_H24, PM, INT: Bits in TRECR1 register
BSY: Bit in registers TRESEC, TREMIN, TREHR, and TREWK
BSY
Feb 29, 2008
fC4
bit
TRESEC
register
Real-Time Clock Mode
MNIE
SEIE
Overflow
Page 271 of 485
1/2
TREMIN
register
HRIE
Overflow
4-bit counter
H12_H24
(1/16)
bit
Data bus
TREHR
register
PM
bit
DYIE
Overflow
WKIE
8-bit counter
(1/256)
TREWK
register
000
(1s)
Overflow
Timing
control
INT
bit
Timer RE
interrupt
14. Timers
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