m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 169

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

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R
M
e
E
3
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J
Figure 14.10 Two-phase Pulse (A-phase and B-phase) and Z-phase
Figure 14.11 Counter Reset Timing
2
0
1
9
C
3 .
B
8 /
0
1
14.1.2.1 Counter Reset by Two-Phase Pulse Signal Processing
3
0
The timer counter is reset to "0" by a Z-phase input when processing a two-phase pulse signal.
This function can be used in timer A3 event counter mode, two-phase pulse signal processing, free-
run type or multiply-by-4 processing. The Z-phase signal is applied to the INT2 pin.
When the TAZIE bit in the ONSF register is set to "1" (Z-phase input enabled), the timer counter can
be reset by a Z-phase input. To reset the timer counter by a Z-phase input, set the TA3 register to
"0000
Z-phase input is enabled when the edge of the signal applied to the INT2 pin is detected. The POL bit
in the INT2IC register can determine edge polarity. The Z-phase must have a pulse width of one timer
A3 count source cycle or more. Figure 14.10 shows two-phase pulses (A-phase and B-phase) and
the Z-phase.
Z-phase input resets the counter in the next count source following Z-phase input. Figure 14.11 shows
the counter reset timing.
Timer A3 interrupt request is generated twice when a timer A3 overflow or underflow, and a counter
reset by INT2 input occur at the same time. Do not use the timer A3 interrupt request when this
function is used.
3
J
G
4
a
0 -
n
o r
3 .
1
TA3
(A-phase)
TA3
(B-phase)
Count source
INT2
(Z-phase)
u
, 1
3
p
16
1
OUT
2
IN
(
" beforehand.
M
TA3
(A-phase)
TA3
(B-phase)
Count source
INT2
(Z-phase)
Counter value
0
(1)
_______
0
3
6
2
OUT
IN
C
(1)
8 /
Page 146
Timer counter is reset at this timing
Pulse width of one count source cycle
or more is required
, 3
M
3
2
C
f o
8 /
4
3
8
m
) T
8
m+1
1
NOTES:
2
1. When the rising edge of INT2 is selected.
NOTES:
1. When the rising edge of INT2 is selected.
3
4
_______
5
_______
14. Timer (Timer A)