R5F211B1SP#U0 Renesas Electronics America, R5F211B1SP#U0 Datasheet - Page 94

• Manufacturer Part Number: R5F211B1SP#U0
• Description: IC R8C MCU FLASH 4K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/1Br

Specifications of R5F211B1SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SIO, SSU, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-SSOP
• For Use With: R0K5211B4S001BE - KIT STARTER FOR R8C/18191A1BR0K5211B4S000BE - KIT DEV EVALUATION R8C/1BR0E521174CPE10 - EMULATOR COMPACT R8C/18/19/1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/1A Group, R8C/1B Group
Rev.1.30
REJ09B0252-0130
10.6
10.6.1
10.6.2
10.6.3
10.6.4
10.6.5
•
•
When entering stop mode, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled) and 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 4 NOP instructions following the JMP.B instruction after the instruction which sets the CM10 bit
to 1.
When entering wait mode, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled) and
execute the WAIT instruction. An instruction queue pre-reads 4 bytes from the WAIT instruction and the
program stops. Insert at least 4 NOP instructions after the WAIT instruction.
Since the oscillation stop detection function cannot be used if the main clock frequency is below 2 MHz, set bits
OCD1 to OCD0 to 00b (oscillation stop detection function disabled) in this case.
Ask the manufacturer of the oscillator to specify the best oscillation circuit constants for your system.
The high-speed on-chip oscillator frequency may be changed up to 10%
during auto-program operation or auto-erase operation.
The high-speed on-chip oscillator frequency after auto-program operation ends or auto-erase operation ends is
held the state before the program command or block erase command is generated. Also, this note is not
applicable when the read array command, read status register command, or clear status register command is
generated. The application products must be designed with careful considerations for the frequency change.
NOTE:
Program example to enter stop mode
Program example to execute the WAIT instruction
Notes on Clock Generation Circuit
1. Change ratio to 8 MHz frequency adjusted in shipping.
Dec 08, 2006
Stop Mode
Wait Mode
Oscillation Stop Detection Function
Oscillation Circuit Constants
High-Speed On-Chip Oscillator Clock
Page 76 of 315
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
(1)
in flash memory CPU rewrite mode
10. Clock Generation Circuit