HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 356
HD6432160
Manufacturer Part Number
HD6432160
Description
Hitachi 16-Bit Single-Chip Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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13.4.5
By using the timer connection facility and TMR_1, the fall of the IVI signal can be shifted
backward by the specified number of IHI signal waveforms. Also, the fall of the IVI signal can be
synchronized with the rise of the IHI signal.
To perform 8-bit timer divided waveform period measurement, TCNT in TMR_1 is set to count
external clock (IHI signal) pulses, and to be cleared on the rising edge of the external reset signal
(inverse of the IVI signal). The number of IHI signal pulses until the fall of the IVI signal is
written in TCORB.
Since the IVI signal supplied to the IVO signal selection circuit is normally set on the rise of the
IVI signal and reset on the fall, its waveform is the same as that of the original IVI signal. When
fall modification is selected, a reset is performed on a TMR_1 TCORB compare-match in
TMR_1.
The fall of the waveform generated in this way can be synchronized with the rise of the IHI signal,
regardless of whether or not fall modification is selected.
Examples of TCR, TCSR, and TCORB settings in TMR_1 are shown in table 13.8, and the fall
modification/IHI synchronization timing chart is shown in figure 13.7.
Table 13.8 Examples of TCR, TCSR, and TCORB Settings
Rev. 2.0, 08/02, page 316 of 788
Register
TCR in
TMR_1
TCSR in
TMR_1
TCORB in TMR_1
IVI Signal Fall Modification and IHI Synchronization
Bit
7
6
5
4 and 3
2 to 0
3 to 0
Abbreviation
CMIEB
CMIEA
OVIE
CCLR1 and
CCLR0
CKS2 to CKS0
OS3 to OS0
Contents
0
0
0
11
101
0011
1001
H'03
(example)
Description
Interrupts due to compare-match and
overflow are disabled
TCNT is cleared by the rising edge of the
external reset signal (inverse of the IVI
signal)
TCNT is incremented on the rising edge of
the external clock (IHI signal)
Not changed by compare-match B; output
inverted by compare-match A (toggle
output)
When TCORB < TCORA, 1 output on
compare-match B, 0 output on compare-
match A
Compare-match on the 4th (example) rise
of the IHI signal after the rise of the
inverse of the IVI signal
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