R5F211B1SP#U0 Renesas Electronics America, R5F211B1SP#U0 Datasheet - Page 104

• 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 12.5
Address bus
12.1.6.4
CPU clock
Data bus
An interrupt sequence is performed between an interrupt request acknowledgement and interrupt routine
execution.
When an interrupt request is generated while an instruction is being executed, the CPU determines its interrupt
priority level after the instruction is completed. The CPU starts the interrupt sequence from the following cycle.
However, for the SMOVB, SMOVF, SSTR, or RMPA instruction, if an interrupt request is generated while the
instruction is being executed, the MCU suspends the instruction to start the interrupt sequence. The interrupt
sequence is performed as indicated below. Figure 12.5 shows the Time Required for Executing Interrupt
Sequence.
After the interrupt sequence is completed, instructions are executed from the starting address of the interrupt
routine.
NOTE:
The undefined state depends on the instruction queue buffer. A read cycle occurs when the instruction queue buffer is
ready to acknowledge instructions.
WR
RD
(1) The CPU gets interrupt information (interrupt number and interrupt request level) by reading address
(2) The FLG register is saved to a temporary register
(3) The I, D, and U flags in the FLG register are set as follows:
(4) The CPU’s internal temporary register
(5) The PC is saved to the stack.
(6) The interrupt priority level of the acknowledged interrupt is set in the IPL.
(7) The starting address of the interrupt routine set in the interrupt vector is stored in the PC.
Dec 08, 2006
1. This register cannot be used by user.
00000h. The IR bit for the corresponding interrupt is set to 0 (interrupt not requested).
interrupt sequence.
The I flag is set to 0 (interrupts disabled).
The D flag is set to 0 (single-step interrupt disabled).
The U flag is set to 0 (ISP selected).
However, the U flag does not change state if an INT instruction for software interrupt number 32 to 63
is executed.
1
Interrupt Sequence
Time Required for Executing Interrupt Sequence
2
Address
0000h
information
Interrupt
3
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4
5
Undefined
Undefined
Undefined
6
7
8
(1)
SP-2 SP-1
is saved to the stack.
9
contents
SP-2
10
contents
SP-1
SP-4
11
contents
(1)
SP-4
12
in the CPU immediately before entering the
SP-3
contents
SP-3
13
VEC
14
contents
VEC
15
VEC+1
contents
VEC+1
16
17
VEC+2
contents
VEC+2
18
12. Interrupts
19
PC
20