R5F21257SYFP#U0 Renesas Electronics America, R5F21257SYFP#U0 Datasheet - Page 92
![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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R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
10. Clock Generation Circuit
The clock generation circuit has:
Table 10.1 lists the Specifications of Clock Generation Circuit. Figure 10.1 shows a Clock Generation Circuit. Figures
10.2 to 10.8 show clock associated registers. Figure 10.9 shows the Procedure for Enabling Reduced Internal Power
Consumption Using VCA20 bit.
Table 10.1
NOTES:
Applications
Clock frequency 0 to 20 MHz
Connectable
oscillator
Oscillator
connect pins
Oscillation stop,
restart function
Oscillator status
after reset
Others
• XIN clock oscillation circuit
• XCIN clock oscillation circuit
• Low-speed on-chip oscillator
• High-speed on-chip oscillator
1. These pins can be used as P4_6 or P4_7 when using the on-chip oscillator clock as the CPU clock while the
2. These pins can be used as P4_3 and P4_4 when using the XIN clock oscillation circuit and on-chip oscillator
3. Set the CM05 bit in the CM0 register to 1 (XIN clock stopped) and the CM13 bit in the CM1 register to 1 (XIN-
4. The clock frequency is automatically set to up to 20 MHz by a divider when using the high-speed on-chip
Item
XIN clock oscillation circuit is not used.
clock for a CPU clock while the XCIN clock oscillation circuit is not used.
XOUT pin) when an external clock is input.
oscillator as the CPU clock source.
Feb 29, 2008
Specifications of Clock Generation Circuit
• Peripheral function
• Ceramic resonator
• Crystal oscillator
XIN, XOUT
Usable
Stop
Externally
generated clock can
be input
• CPU clock source
Oscillation Circuit
clock source
XIN Clock
Page 73 of 485
(3)
(1)
• CPU clock source
• Timer RA and timer RE
• Crystal oscillator
XCIN, XCOUT
Usable
Stop
• Externally generated
• On-chip feedback
32.768 kHz
clock source
clock can be input
resistor Rf (connected/
not connected,
selectable)
XCIN Clock Oscillation
Circuit
(2)
• CPU clock source
• Peripheral function
• CPU and peripheral
Approx. 40 MHz
−
−
Usable
Stop
−
(1)
High-Speed On-Chip
clock source
function clock
sources when XIN
clock stops oscillating
Oscillator
On-Chip Oscillator
(4)
10. Clock Generation Circuit
• CPU clock source
• Peripheral function
• CPU and peripheral
Approx. 125 kHz
−
−
Usable
Oscillate
−
(1)
clock source
function clock
sources when XIN
clock stops oscillating
Low-Speed On-Chip
Oscillator
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