R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 136

• Manufacturer Part Number: R5F21324CNSP#U0
• Description: MCU 1KB FLASH 16K ROM 20-LSSOP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/32Cr

Specifications of R5F21324CNSP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, PWM, Voltage Detect, WDT
• Number Of I /o: 15
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-LSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/32C Group
REJ09B0573-0100 Rev.1.00 Dec. 18, 2009
Page 107 of 573
9.7.1.1
9.7.1.2
9.7.1.3
9.7.1.4
The XIN clock divided by 1 (no division), 2, 4, 8, or 16 is used as the CPU clock. 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 for timer RA.
Also, if the FRA00 bit is set to 1, fOCO40M can be used for timer RC.
If the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection
circuit.
The XCIN clock divided by 1 (no division), 2, 4, 8, or 16 is used as the CPU clock.
In this mode, low consumption operation is enabled by stopping the XIN clock and the high-speed on-chip
oscillator, and by setting the FMR27 bit in the FMR2 register to 1 (low-current-consumption read mode
enabled). When the CPU clock is set to the XCIN clock divided by 1 (no division), 2, 4, or 8, low-current-
consumption read mode can be used. However, do not use low-current-consumption read mode when the
frequency of the selected CPU clock is 3 kHz or below. After setting the divide ratio of the CPU clock, set the
FMR27 bit to 1.
Also, if the FRA00 bit is set to 1, fOCO40M can be used for timer RC.
If the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection
circuit.
To enter wait mode from low-speed clock mode, lower consumption current in wait mode is enabled by setting
the VCA20 bit in the VCA2 register to 1 (internal power low consumption enabled).
To reduce the power consumption, refer to 30. Reducing Power Consumption.
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 is used as the CPU clock. If the FRA00 bit is set to 1,
fOCO40M can be used for timer RC.
Also, if the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection
circuit.
If the CM14 bit in the CM1 register is set to 0 (low-speed on-chip oscillator on) and the FRA01 bit in the FRA0
register is set to 0, the low-speed on-chip oscillator is used as the on-chip oscillator clock. At this time, the on-
chip oscillator clock divided by 1 (no division), 2, 4, 8 or 16 is used as the CPU clock. The on-chip oscillator
clock is also the clock source for the peripheral function clocks. If the FRA00 bit is set to 1, fOCO40M can be
used for timer RC.
Also, if the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection
circuit.
In this mode, low consumption operation is enabled by stopping the XIN clock and the high-speed on-chip
oscillator, and by setting the FMR27 bit in the FMR2 register to 1 (low-current-consumption read mode
enabled). When the CPU clock is set to the low-speed on-chip oscillator clock divided by 4, 8, or 16, low-
current-consumption read mode can be used. After setting the divide ratio of the CPU clock, set the FMR27 bit
to 1.
To enter wait mode from low-speed clock mode, lower consumption current in wait mode is enabled by setting
the VCA20 bit in the VCA2 register to 1 (internal power low consumption enabled).
To reduce the power consumption, refer to 30. Reducing Power Consumption.
High-Speed Clock Mode
Low-Speed Clock Mode
High-Speed On-Chip Oscillator Mode
Low-Speed On-Chip Oscillator Mode
9. Clock Generation Circuit