R5F21324ANSP#U1 Renesas Electronics America, R5F21324ANSP#U1 Datasheet - Page 557

• 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 527 of 583
Figure 31.3
31.2.11 Low-Current-Consumption Read Mode
31.2.12 Others
Notes:
In low-speed clock mode and low-speed on-chip oscillator mode, the current consumption when reading the
flash memory can be reduced by setting the FMR27 bit in the FMR2 register to 1 (enabled).
Figure 31.3 shows the Handling Procedure Example of Low-Current-Consumption Read Mode.
Set the MSTTRD bit in the MSTCR register to 1.
The power consumption of the peripheral functions can be reduced.
FMR27: Bit in FMR2 register
1. To set the FMR27 bit to 1, first write 0 and then write 1 immediately.
2. In low-current-consumption read mode, set the FMR01 bit in the FMR0 register to 0 (CPU rewrite mode disabled).
After writing 0, do not generate an interrupt before writing 1.
Preliminary specification
Specifications in this manual are tentative and subject to change.
Handling Procedure Example of Low-Current-Consumption Read Mode
Step (1)
Step (2)
Step (3)
Step (4)
Step (5)
Step (6)
Step (7)
Step (8)
Nov 05, 2008
(low-current-consumption read mode enabled)
(Wait until the high-speed on-chip oscillator clock
(low-current-consumption read mode disabled)
Enter low-current-consumption read mode
Stop the high-speed on-chip oscillator clock
Start the high-speed on-chip oscillator clock
Enter high-speed on-chip oscillator mode
low-current-consumption read mode
low-speed on-chip oscillator mode
Handling procedure for enabling
Enter low-speed clock mode or
oscillation stabilizes)
by FMR27 bit
FMR27 ← 1
FMR27 ← 0
(2)
(1)
31. Reducing Power Consumption