R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 136

• 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 12.14
Figure 12.15
12.2.2
INTi input
Sampling
timing
IR bit in
INTiIC register
The INTi input contains a digital filter. The sampling clock is selected by bits INTiF1 to INTiF0 in the INTF
register.
The INTi level is sampled every sampling clock cycle and if the sampled input level matches three times, the IR
bit in the INTiIC register is set to 1 (interrupt requested).
Figure 12.14 shows the Configuration of INTi Input Filter. Figure 12.15 shows an Operating Example of INTi
Input Filter.
Feb 29, 2008
Port direction
INTi Input Filter (i = 0 to 3)
register
This is an operation example when bits INTiF1 to INTiF0 in the
INTiF register are set to 01b, 10b, or 11b (digital filter enabled).
i = 0 to 3
Configuration of INTi Input Filter
Operating Example of INTi Input Filter
INTi
(1)
INTiF0, INTiF1: Bits in INTF register
INTiEN, INTiPL: Bits in INTEN register
i = 0 to 3
NOTE:
1. INT0: Port P4_5 direction register
f32
f1
f8
INT2: Port P6_6 direction register
INT1: Port P1_5 direction register when using the P1_5 pin
INT3: Port P6_7 direction register
INTiF1 to INTiF0
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= 01b
= 10b
= 11b
Port P1_7 direction register when using the P1_7 pin
Sampling clock
matches 3x)
Digital filter
(input level
Other than
INTiF1 to INTiF0
= 00b
INTiEN
= 00b
Both edges
detection
circuit
Set to 0 by a program
INTiPL = 0
INTiPL = 1
INTi interrupt
12. Interrupts