R5F21258SNFP#U0 Renesas Electronics America, R5F21258SNFP#U0 Datasheet - Page 107

• Manufacturer Part Number: R5F21258SNFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21258SNFP#U0

• Core Size: 16/32-Bit
• Program Memory Size: 64KB (64K x 8)
• Core Processor: R8C
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Type: FLASH
• Ram Size: 3K 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: 52-LQFP
• No. Of I/o's: 41
• Ram Memory Size: 3KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• Digital Ic Case Style: LQFP
• Supply Voltage Range: 2.2V To 5.5V
• Embedded Interface Type: I2C, UART
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: YMCRPR8C25 - REF PLATFORM MOTOR CTRL R8C/25R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
10.5.1.1
10.5.1.2
10.5.1.3
10.5.1.4
The XIN clock divided by 1 (no division), 2, 4, 8, or 16 provides the CPU clock. Set the CM06 bit to 1 (divide-
by-8 mode) when transiting to high-speed on-chip oscillator mode, low-speed on-chip oscillator mode. If the
CM14 bit is set to 0 (low-speed on-chip oscillator on) or the FRA00 bit in the FRA0 register is set to 1 (high-
speed on-chip oscillator on), fOCO can be used as timer RA. When the FRA00 bit is set to 1, fOCO40M can be
used as timer RD. When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the
watchdog timer and voltage detection circuit.
The XCIN clock divided by 1 (no division) provides the CPU clock.
In this mode, stopping the XIN clock and high-speed on-chip oscillator, and setting the FMR47 bit in the FMR4
register to 1 (flash memory low consumption current read mode enabled) enables low consumption operation.
When the FRA00 bit is set to 1, fOCO40M can be used as timer RD. When the CM14 bit is set to 0 (low-speed
on-chip oscillator on), fOCO-S can be used for the watchdog timer and voltage detection circuit.
To enter wait mode from low-speed clock mode, setting the VCA20 bit in the VCA2 register to 1 (internal
power low consumption enabled) enables lower consumption current in wait mode.
When enabling reduced internal power consumption using the VCA20 bit, follow Figure 10.13 Procedure for
Enabling Reduced Internal Power Consumption Using VCA20 bit.
The high-speed on-chip oscillator is used as the on-chip oscillator clock when the FRA00 bit in the FRA0
register is set to 1 (high-speed on-chip oscillator on) and the FRA01 bit in the FRA0 register is set to 1. The on-
chip oscillator divided by 1 (no division), 2, 4, 8, or 16 provides the CPU clock. Set the CM06 bit to 1 (divide-
by-8 mode) when transiting to high-speed clock mode. If the FRA00 bit is set to 1, fOCO40M can be used as
timer RD. When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the
watchdog timer and voltage detection circuit.
If the CM14 bit in the CM1 register is set to 0 (low-speed on-chip oscillator on) or the FRA01bit in the FRA0
register is set to 0, the low-speed on-chip oscillator provides the on-chip oscillator clock.
The on-chip oscillator clock divided by 1 (no division), 2, 4, 8 or 16 provides the CPU clock. The on-chip
oscillator clock is also the clock source for the peripheral function clocks. Set the CM06 bit to 1 (divide-by-8
mode) when transiting to high-speed clock mode. When the FRA00 bit is set to 1, fOCO40M can be used as
timer RD. When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used as the
watchdog timer and voltage detection circuit.
In this mode, stopping the XIN clock and high-speed on-chip oscillator, and setting the FMR47 bit in the FMR4
register to 1 (flash memory low consumption current read mode enabled) enables low consumption operation.
To enter wait mode from low-speed on-chip oscillator mode, setting the VCA20 bit in the VCA2 register to 1
(internal power low consumption enabled) enables lower consumption current in wait mode.
When enabling reduced internal power consumption using the VCA20 bit, follow Figure 10.13 Procedure for
Enabling Reduced Internal Power Consumption Using VCA20 bit.
Feb 29, 2008
High-Speed Clock Mode
Low-Speed Clock Mode
High-Speed On-Chip Oscillator Mode
Low-Speed On-Chip Oscillator Mode
Page 88 of 485
10. Clock Generation Circuit