Toshiba – Toshiba TMP87CP24AF User Manual
Page 39
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TOSHIBA
TMP87CM24A/P24A
Note
6:
Change
EINTCR
only
when
IMF
=
0.
After
changing
EINTCR,
interrupt
latches
of
external
interrupt inputs must be cleared to "0" using load instruction.
Example : Changes INT2 edge selection from rising edge to falling edge
Dl
; IMF <-0 (disables interrupt service)
LD
(EINTCR), 10000110B
; INT2ES ^ 1 (changes edge selection)
LD
(ILL),01111111B
; IL7 ^ 0 (dears interrupt latch)
El
; IMF <-1 (enables interrupt service)
Note?:
if
changing
the
contents
of
INT1ES
during
NORMAL1/2
mode,
interrupt
latch
of
external
interrupt input INTI must be cleared after 14 machine cycles (when INT1NC =1) or 50 machine
cycles (when INT1NC = 0) from the time of changing. During SLOW mode, 3 machine cycles are
required.
Note 8: In order to change of external interrupt input by rewriting the contents of INT2ES and INT3ES
during
NORMAL1/2
mode,
clear
interrupt latches
of external interrupt
inputs
(INT2
and
INT3)
after 8 machine cycles from the time of rewriting. During SLOW mode, 3 machine cycles are
required.
Note 9: In order to change an edge of timer counter input by rewriting the contents of INT2ES and
INT3ES during NORMAL 1/2 mode, rewrite the contents after timer counter is stopped (TC*s = 0),
that is, interrupt disable state. Then, clear interrupt laches of external interrupt inputs (INT2
and INT3) after 8 machine cycles from the time of rewriting to change to interrupt enable state.
Finally, start timer counter. During SLOW mode, 3 machine cycles are required.
Example : When changing TCI pin inputs edge in external trigger timer mode from rising edge to
falling edge.
8
-machine
cycles
I
LD(TC1CR),01001000B
Dl
LD (EINTCR),00000100B
NOP
to
NOP
LD (ILL),01111111B
El
LD(TC1CR),01111000B
T C I 0 0 (stop TCI)
IMF
0
(disable
interrupt
service)
INT2ES <- 1 (change edge selection)
IL7 <-0 (clear interrupt latch)
IMF
1
(enable
interrupt
service)
TCIS^II (startTCI)
Note 10:
When high-impedance is specified for port output in stop mode, port input is forcibly fixed
to
low
level
internally.
Thus,
interrupt
latches
of
external
interrupt
inputs
except
I
NTS
(P20/STOP) which are also used as ports may be set to "1". To specify high-impedance for
port output in stop mode, first disable interrupt service (IMF = 0), activate stop mode. After
releasing
stop
mode,
clear
interrupt
latches
using
load
instruction,
then,
enable
interrupt
service.
Example : Activating stop mode
LD (SYSCR1),01000000B
Dl
SET
LDW
El
(SYSCRI).STOP
(IL), 1111011101010111B
OUTEN
<-
0
(specifies
high-impedance)
IMF <- 0 (disables interrupt service)
STOP <- 1 (activates stop mode)
IL11,7,
5,
3
<-0
(clears
interrupt
latches)
IMF <- 1 (enables interrupt service)
3
-
24-39
2002
-
10-03