M16CSLASH1N datasheet(72/238 Pages) RENESAS

72 / 238 page

Rev.1.00

Oct 20, 2004

page 60 of 222

M16C/1N Group

10. Interrupt

REJ09B0007-0100Z

b5 b4

External input enable register

INT0EN

INT0 input enable bit (Note 1)

0 : Disabled

1 : Enabled

INT0F0

INT0F1

INT0 input filter select bit

INT0PL

INT0 input polarity select bit

(Note 1)

0 : One edge

1 : Two edges

INT1EN

INT1 input enable bit

0 : Disabled

1 : Enabled

INT1PL

INT1 input polarity select bit

0 : One edge

1 : Two edges

INT2EN

INT2 input enable bit

0 : Disabled

1 : Enabled

INT2PL

INT2 input polarity select bit

0 : One edge

1 : Two edges

INT3EN

INT3 input enable bit

0 : Disabled

1 : Enabled

INT0F2

UART0 receive hardware

interrupt enable bit (Note 1)

0 : Disabled

1 : Enabled

INT3PL

INT3 input polarity select bit

0 : One edge

1 : Two edges

Nothing is assigned.

When write, nothing can be written. When read, their contents are indeterminate.

Symbol

INTEN

Address

009616

When reset

0016

Function

Bit name

Bit symbol

INT0 input filter select register

Symbol

INT0F

Address

001E16

When reset

XXXXX0002

Function

Bit name

Bit symbol

0 0 : No filter

0 1 : Filter with f1 sampling

1 0 : Filter with f8 sampling

1 1 : Filter with f32 sampling

b1 b0

Note 1: Interrupts used for debugging purposes only. Be sure to set "0" to this bit.

Note 1: This bit must be set in condition of the INT0 pin one-shot trigger control bit (bit 6 at address 008416)="0"

(INT0 pin one-shot trigger invalid).

______

10.2 INT Interrupt

________

10.2.1 INT0 Interrupt

INT0 to INT3 are triggered by the edges of external inputs. The edge polarity of INT0 to INT2 is selected

using the polarity select bit (bit 4 at addresses 005D16, 005E16 and 005F16). Input to INT0 is available

via filter with three different sampling frequencies.

As to external interrupt input, an interrupt can be generated both at the rising edge and at the falling

________

edge by setting the INTi (i=0 to 3) input polarity select bit of the external input enable register (address

009616) to "1". To select both edges, set the polarity switching bit of the corresponding interrupt con-

trol register to "0" (falling edge). To select one edge, set the polarity switching bit of the corresponding

interrupt control register to either "1" (raising edge) or "0" (falling edge). Please note that when one

edge is selected using INT3, the polarity will be a falling edge.

After setting the external input enable register, clear the interrupt request bit, and then enable the

corresponding input interrupt. Moreover, you should write to the external input enable bit only under

conditions where the corresponding input interrupt is disabled.

Figure 10.10 shows the external input related registers.

Figure 10.10 External input related registers

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