R5F2121AJFP#U0 Renesas Electronics America, R5F2121AJFP#U0 Datasheet - Page 128

• Manufacturer Part Number: R5F2121AJFP#U0
• Description: MCU FLASH 96K 5K CMOS 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/21r

Specifications of R5F2121AJFP#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: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/20 Group, R8C/21 Group
Rev.2.00
REJ09B0250-0200
12.6
12.6.1
12.6.2
12.6.3
Do not read the address 00000h by a program. When a maskable interrupt request is acknowledged, the CPU
reads interrupt information (interrupt number and interrupt request level) from 00000h in the interrupt
sequence. At this time, the acknowledged interrupt IR bit is set to 0.
If the address 00000h is read in a program, the IR bit for the interrupt which has the highest priority among the
enabled interrupts is set to 0. This may cause a problem that the interrupt is canceled, or an unexpected interrupt
is generated.
Set any value in the SP before an interrupt is acknowledged. The SP is set to 0000h after reset. Therefore, if an
interrupt is acknowledged before setting any value in the SP, the program may run out of control.
Either an “L” level or an “H” level of width shown in the Electrical Characteristics is necessary for the signal
input to the INT0 to INT3 pins and KI0 to KI3 pins regardless of the CPU clocks. For details, refer to Table
20.19 External Interrupt INTi (i = 0 to 3) Input, Table 20.25 External Interrupt INTi (i = 0 to 3) Input.
Notes on Interrupts
Aug 27, 2008
Reading Address 00000h
SP Setting
External Interrupt and Key Input Interrupt
Page 110 of 458
12. Interrupts