R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 137

• 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
12.3
Figure 12.16
A key input interrupt request is generated by one of the input edges of pins K10 to K13. The key input interrupt can
be used as a key-on wake-up function to exit wait or stop mode.
The KIiEN (i = 0 to 3) bit in the KIEN register can select whether or not the pins are used as KIi input. The KIiPL
bit in the KIEN register can select the input polarity.
When inputting “L” to the KIi pin which sets the KIiPL bit to 0 (falling edge), the input of the other pins K10 to
K13 is not detected as interrupts. Also, when inputting “H” to the KIi pin, which sets the KIiPL bit to 1 (rising
edge), the input of the other pins K10 to K13 is not detected as interrupts.
Figure 12.16 shows a Block Diagram of Key Input Interrupt.
Pull-up
transistor
KI3
KI2
KI1
KI0
Key Input Interrupt
Feb 29, 2008
Pull-up
transistor
Pull-up
transistor
Pull-up
transistor
Block Diagram of Key Input Interrupt
Page 118 of 485
PU02 bit in PUR0 register
PD1_3 bit in PD1 register
KI3PL = 0
KI3PL = 1
KI2PL = 0
KI2PL = 1
KI1PL = 0
KI1PL = 1
KI0PL = 0
KI0PL = 1
KI3EN bit
KI2EN bit
KI1EN bit
KI0EN bit
PD1_3 bit
PD1_2 bit
PD1_1 bit
PD1_0 bit
KI0EN, KI1EN, KI2EN, KI3EN,
KI0PL, KI1PL, KI2PL, KI3PL: Bits in KIEN register
PD1_0, PD1_1, PD1_2, PD1_3: Bits in PD1 register
KUPIC register
Interrupt control
circuit
Key input interrupt
request
12. Interrupts