M306N4FGTFP Renesas Electronics America, M306N4FGTFP Datasheet - Page 107

• Manufacturer Part Number: M306N4FGTFP
• Description: IC M16C MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/6Nr

Specifications of M306N4FGTFP

• Core Processor: M16C/60
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, I²C, IEBus, SIO, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 10K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 26x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

M16C/6N Group (M16C/6N4)
Rev.2.40
REJ09B0009-0240
Figure 10.5 Time Required for Executing Interrupt Sequence
10.5.4 Interrupt Sequence
An interrupt sequence — what are performed over a period from the instant an interrupt is accepted to the
instant the interrupt routine is executed — is described here.
If an interrupt request is generated while an instruction is being executing, the CPU determines its priority
when the execution of the instruction is completed, and transfers control to the interrupt sequence from
the next cycle. However, for the SMOVB, SMOVF, SSTR or RMPA instruction, if an interrupt request is
generated while the instruction is being executing, the MCU temporarily suspends the instruction being
executed, and transfers control to the interrupt sequence.
The CPU behavior during the interrupt sequence is described below.
Figure 10.5 shows the Time Required for Executing Interrupt Sequence.
(1) The CPU obtains interrupt information (interrupt number and interrupt request level) by reading
(2) The FLG register, prior to an interrupt sequence, is saved to a temporary register
(3) Flags I, D, and U in the FLG register become as follows:
(4) The temporary register
(5) The PC is saved to the stack.
(6) The interrupt priority level of the acknowledged interrupt in IPL is set.
(7) The start address of the relevant interrupt routine set in the interrupt vector is stored in the PC.
After the interrupt sequence is completed, an instruction is executed from the starting address of the
interrupt routine.
NOTE:
Address bus
NOTES:
1. The undefined state depends on the instruction queue buffer.
2. The WR signal timing shown here is for the case where the stack is located in the internal RAM.
1. This register cannot be accessed by user.
CPU clock
address 000000h. Then, the IR bit applicable to the interrupt information is set to 0 (interrupt
requested).
• The I flag is set to 0 (interrupt 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 Nos. 32 to 63 is
executed.
Apr 14, 2006
Data bus
A read cycle occurs when the instruction queue buffer is ready to accept instructions.
WR
RD
(2)
1
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Address
0000h
information
2
Interrupt
3
(1)
within the CPU is saved to the stack.
4
Undefined
Undefined
5
Undefined
6
(1)
(1)
7
(1)
8
SP-2
9
contents
SP-2
10
SP-4
11
contents
SP-4
12
13
vec
contents
vec
14
vec+2
15
contents
vec+2
(1)
within the CPU.
16
17
PC
10. Interrupts
18