R5F211B1SP#U0 Renesas Electronics America, R5F211B1SP#U0 Datasheet - Page 110

• Manufacturer Part Number: R5F211B1SP#U0
• Description: IC R8C MCU FLASH 4K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/1Br

Specifications of R5F211B1SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SIO, SSU, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-SSOP
• For Use With: R0K5211B4S001BE - KIT STARTER FOR R8C/18191A1BR0K5211B4S000BE - KIT DEV EVALUATION R8C/1BR0E521174CPE10 - EMULATOR COMPACT R8C/18/19/1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/1A Group, R8C/1B Group
Rev.1.30
REJ09B0252-0130
Figure 12.12
Figure 12.13
12.2.2
INT0 input
Sampling
timing
IR bit in
INT0IC register
The INT0 input contains a digital filter. The sampling clock is selected by bits INT0F1 to INT0F0 in the INT0F
register. The INT0 level is sampled every sampling clock cycle and if the sampled input level matches three
times, the IR bit in the INT0IC register is set to 1 (interrupt requested).
Figure 12.12 shows the Configuration of INT0 Input Filter. Figure 12.13 shows an Operating Example of INT0
Input Filter.
Dec 08, 2006
INT0 Input Filter
Port P4_5
direction
INT0
register
This is an operating example in which bits INT0F1 to INT0F0 in the
INT0F register are set to 01b, 10b, or 11b (digital filter enabled).
Configuration of INT0 Input Filter
Operating Example of INT0 Input Filter
INT0F0, INT0F1: Bits in INT0F register
INT0EN, INT0PL: Bits in INTEN register
f32
f1
f8
INT0F1 to INT0F0
= 01b
= 10b
= 11b
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Sampling clock
matches 3x)
Digital filter
(input level
Other than
INT0F1 to INT0F0
= 00b
INT0EN
= 00b
Both edges
detection
circuit
Set to 0 by a program
INT0PL = 0
INT0PL = 1
INT0 interrupt
12. Interrupts