M16CSLASH62P datasheet(83/349 Pages) MITSUBISHI

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Mitsubishi microcomputers

M16C / 62P Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Interrupts

Under

development

Preliminary Specifications Rev.1.0

Specifications in this manual are tentative and subject to change.

I Flag

The I flag enables or disables the maskable interrupt. Setting the I flag to “1” (= enabled) enables the

maskable interrupt. Setting the I flag to “0” (= disabled) disables all maskable interrupts.

IR Bit

The IR bit is set to “1” (= interrupt requested) when an interrupt request is generated. Then, when the

interrupt request is accepted and the CPU branches to the corresponding interrupt vector, the IR bit is

cleared to “0” (= interrupt not requested).

The IR bit can be cleared to “0” in a program. Note that do not write “1” to this bit.

Table 1.11.4. Interrupt Priority Levels

Enabled by IPL

Table 1.11.3. Settings of Interrupt Priority

Levels

ILVL2 to ILVL0 bits

Interrupt priority

level

Priority

order

0002

0012

0102

0112

1002

1012

1102

1112

Level 0 (interrupt disabled)

Level 1

Level 2

Level 3

Level 4

Level 5

Level 6

Level 7

Low

High

Enabled interrupt priority levels

Interrupt levels 1 and above are enabled

Interrupt levels 2 and above are enabled

Interrupt levels 3 and above are enabled

Interrupt levels 4 and above are enabled

Interrupt levels 5 and above are enabled

Interrupt levels 6 and above are enabled

Interrupt levels 7 and above are enabled

All maskable interrupts are disabled

IPL

0002

0012

0102

0112

1002

1012

1102

1112

ILVL2 to ILVL0 Bits and IPL

Interrupt priority levels can be set using the ILVL2 to ILVL0 bits.

Table 1.11.3 shows the settings of interrupt priority levels and Table 1.11.4 shows the interrupt priority

levels enabled by the IPL.

The following are conditions under which an interrupt is accepted:

· I flag = “1”

· IR bit = “1”

· interrupt priority level > IPL

The I flag, IR bit, ILVL2 to ILVL0 bits and IPL are independent of each other. In no case do they affect one

another.

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