R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 46

• Manufacturer Part Number: R5F21257SNFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21257SNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 52-LQFP
• For Use With: R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
Figure 5.3
Figure 5.4
Internal reset
signal
Address
(internal address
signal)
CPU clock
Option Function Select Register
RESET pin
b7 b6 b5 b4 b3 b2 b1 b0
NOTES:
fOCO-S
NOTES:
1.
2.
3. If the block including the OFS register is erased, FFh is set to the OFS register.
1
1. Hardware reset.
2. When the “L” input width to the RESET pin is set to fOCO-S clock × 32 cycles or more, setting the RESET pin to “H” also sets the internal
The OFS register is on the flash memory. Write to the OFS register w ith a program. After w riting is completed, do not
w rite additions to the OFS register.
To use the pow er-on reset, set the LVD0ON bit to 0 (voltage monitor 0 reset enabled after reset).
Feb 29, 2008
reset signal to “H” at the same.
1
Reset Sequence
OFS Register
1
10 cycles or more are needed
fOCO-S clock × 32 cycles
Bit Symbol
CSPROINI
ROMCP1
LVD0ON
WDTON
ROMCR
Symbol
OFS
(b1)
(b4)
(b6)
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—
—
—
Start time of flash memory
(CPU clock × 14 cycles)
Watchdog timer start
select bit
Reserved bit
ROM code protect
disabled bit
ROM code protect bit
Reserved bit
Voltage detection 0
circuit start bit
Reserved bit
Count source protect
mode after reset select
bit
(1)
(1)
(2)
Address
Bit Name
0FFFFh
(2)
CPU clock × 28 cycles
0 : Starts w atchdog timer automatically after reset
1 : Watchdog timer is inactive after reset
Set to 1.
0 : ROM code protect disabled
1 : ROMCP1 enabled
0 : ROM code protect enabled
1 : ROM code protect disabled
Set to 1.
0 : Voltage monitor 0 reset enabled after hardw are
1 : Voltage monitor 0 reset disabled after hardw are
Set to 1.
0 : Count source protect mode enabled after reset
1 : Count source protect mode disabled after reset
reset
reset
0FFFCh
0FFFDh
When Shipping
Function
FFh
(3)
0FFFEh
Content of reset vector
5. Resets
RW
RW
RW
RW
RW
RW
RW
RW
RW