R5F21324ANSP#U1 Renesas Electronics America, R5F21324ANSP#U1 Datasheet - Page 556
R5F21324ANSP#U1
Manufacturer Part Number
R5F21324ANSP#U1
Description
MCU 1KB FLASH 16K ROM 20-LSSOP
Manufacturer
Renesas Electronics America
Series
R8C/3x/32Ar
Datasheet
1.R5F21322ANSPU1.pdf
(629 pages)
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
-
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Under development
R8C/32A Group
REJ09B0458-0020 Rev.0.20
Page 526 of 583
Figure 31.2
31.2.10 Stopping Flash Memory
Notes:
FMR01, FMSTP: Bits in FMR0 register
2. Before switching the CPU clock source, make sure the designated
3. Insert a 60- µ s wait time by a program.
1. After setting the FMR01 bit to 1 (CPU rewrite mode enabled),
In low-speed on-chip oscillator mode and low-speed clock mode, power consumption can be further reduced by
stopping the flash memory using the FMSTP bit in the FMR0 register.
Access to the flash memory is disabled by setting the FMSTP bit to 1 (flash memory stops). The FMSTP bit
must be written to by a program transferred to RAM.
When the MCU enters stop mode or wait mode while CPU rewrite mode is disabled, the power for the flash
memory is automatically turned off. It is turned back on again after the MCU exit stop mode or wait mode. This
eliminates the need to set the FMR0 register.
Figure 31.2 shows the Handling Procedure Example for Reducing Power Consumption Using FMSTP Bit.
clock is stable.
Do not access the flash memory during this wait time.
set the FMSTP bit to 1 (flash memory stops).
Transfer the FMSTP bit setting program to
the RAM
Jump to the FMSTP bit setting program
(The subsequent processing is executed
by the program in the RAM)
Preliminary specification
Specifications in this manual are tentative and subject to change.
Handling Procedure Example for Reducing Power Consumption Using FMSTP Bit
Nov 05, 2008
FMSTP bit setting program
Jump to the specified address in the flash memory
Write 1 to the FMSTP bit (flash memory stops.
low power consumption state)
After writing 0 to the FMR01 bit,
write 1 (CPU rewrite mode enabled)
Enter low-speed clock mode or
low-speed on-chip oscillator mode
Stop the high-speed on-chip oscillator
Write 0 to the FMSTP bit
(flash memory operates)
Write 0 to the FMR01 bit
(CPU rewrite mode disabled)
Wait until the flash memory circuit stabilizes
(60 µ s)
Switch the clock source for the CPU clock
Process in low-speed clock mode or
low-speed on-chip oscillator mode
(3)
31. Reducing Power Consumption
(1)
(2)
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