TMP88CS38FG datasheet(32/226 Pages) TOSHIBA

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TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-32

EINTCR

(00037H)

“0”

INT0

−

INT4

−

INT2

“0”

−

(Initial value: 00*0 *00*)

INT0EN

P50/ INT0 pin configuration

0: P50 input/output port

1: INT0 pin (Port P50 should be set to an input mode)

INT4ES

INT2ES

INT4 and INT2 edge select

0: Rising edge

1: Falling edge

Write

only

Note 1:

fc: High-frequency clock [Hz], *: Don’t care

Note 2:

Edge detection during switching edge selection is invalid.

Note 3:

Do not change EINTCR only when IMF

= 1. After changing EINTCR, interrupt latches of external interrupt

inputs must be cleared to “0” using load instruction.

Note 4:

In order to change of external interrupt input by rewriting the contents of INT2ES and INT4ES during

NORMAL mode, clear interrupt latches of external interrupt inputs (INT2 and INT4) after 8 machine cycles

from the time of rewriting.

Note 5:

In order to change an edge of timer counter input by rewritng the contents of INT2ES during NORMAL

mode, rewrite the contents after timer counter is stopped (TC*s

= 0) , that is, terrupt disable state.

Then, clear a interrupt latch of external interrupt input (INT2) after 8 machine cycles from the time of

rewriting to change to interrupt enable state. Finally, start timer counter.

Example:

When change TC1 pin inputs edge in external trigger timer mode from rising edge falling edge.

LD (TC1CR) , 01001000B

;

TC1S

← 00 (Stops TC1)

;

IMF

← 0 (Disables interrupt service)

LD (EINTCR) , 00000100B

;

INT2ES

← 1 (Change edge selection)

NOP

LD (ILL) , 01111111B

;

IL7

← 0 (Clears interrupt latch)

;

IMF

← 1 (Enable interrupt service)

LD (TC1CR) , 01111000B

;

TC1S

← 11 (Starts TC1)

Figure 1.5.5 External Interrupt Control Register

8-machine

cycles

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