R5F21324ANSP#U1 Renesas Electronics America, R5F21324ANSP#U1 Datasheet - Page 585

• Manufacturer Part Number: R5F21324ANSP#U1
• Description: MCU 1KB FLASH 16K ROM 20-LSSOP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/32Ar

Specifications of R5F21324ANSP#U1

• 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: -

Under development
R8C/32A Group
REJ09B0458-0020 Rev.0.20
Page 555 of 583
33. Usage Notes
33.1
33.1.1
33.1.2
33.1.3
33.1.4
To enter stop mode, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled) and then the
CM10 bit in the CM1 register to 1 (stop mode). An instruction queue pre-reads 4 bytes from the instruction
which sets the CM10 bit to 1 (stop mode) and the program stops.
Insert at least four NOP instructions following the JMP.B instruction after the instruction which sets the CM10
bit to 1.
• Program example to enter stop mode
To enter wait mode with the WAIT instruction, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode
disabled) and then execute the WAIT instruction. An instruction queue pre-reads 4 bytes from the WAIT
instruction and the program stops. Insert at least four NOP instructions after the WAIT instruction.
• Program example to execute the WAIT instruction
Since the oscillation stop detection function cannot be used if the XIN clock frequency is below 2 MHz, set bits
OCD1 to OCD0 to 00b.
Consult the oscillator manufacturer to determine the optimal oscillation circuit constants for the user system.
To use the MCU with supply voltage below VCC = 2.7 V, it is recommended to set the CM11 bit in the CM1
register to 1 (on-chip feedback resistor disabled) and connect the feedback resistor to the chip externally.
Notes on Clock Generation Circuit
Stop Mode
Wait Mode
Oscillation Stop Detection Function
Oscillation Circuit Constants
Preliminary specification
Specifications in this manual are tentative and subject to change.
Nov 05, 2008
LABEL_001:
BCLR
BSET
FSET
BSET
JMP.B
NOP
NOP
NOP
NOP
BCLR
FSET
WAIT
NOP
NOP
NOP
NOP
1,FMR0
0,PRCR
I
0,CM1
LABEL_001
1,FMR0
I
; CPU rewrite mode disabled
; Protect disabled
; Enable interrupt
; Stop mode
; CPU rewrite mode disabled
; Enable interrupt
; Wait mode
33. Usage Notes