HD6433308 HITACHI [Hitachi Semiconductor], HD6433308 Datasheet - Page 173
HD6433308
Manufacturer Part Number
HD6433308
Description
Hitachi Single-Chip MicroComputer
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6433308.pdf
(349 pages)
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Bit 6
CMFA
Bit 5 – Timer Overflow Flag (OVF): This status flag is set to “1” when the timer count overflows
(changes from H’FF to H’00). OVF must be cleared by software. It is set by hardware, however,
and cannot be set by software.
Bit 5
OVF
Bit 4 – Reserved: This bit is always read as “1.” It cannot be written.
Bits 3 to 0 – Output Select 3 to 0 (OS3 to OS0): These bits specify the effect of compare-match
events on the timer output signal (TCOR or TCNT). Bits OS3 and OS2 control the effect of
compare-match B on the output level. Bits OS1 and OS0 control the effect of compare-match A on
the output level.
If compare-match A and B occur simultaneously, any conflict is resolved as explained in item (4) in
section 7.6, "Application Notes."
After a reset, the timer output is "0" until the first compare-match event.
When all four output select bits are cleared to “0” the timer output signal is disabled.
Bit 3
OS3
0
0
1
1
0
1
0
1
Description
To clear CMFA, the CPU must read CMFA after
it has been set to "1," then write a “0” in this bit.
This bit is set to 1 when TCNT = TCORA.
Bit 2
OS2
0
1
0
1
Description
To clear OVF, the CPU must read OVF after
it has been set to "1," then write a “0” in this bit.
This bit is set to 1 when TCNT changes from H’FF to H’00.
Description
No change when compare-match B occurs.
Output changes to “0” when compare-match B occurs.
Output changes to “1” when compare-match B occurs.
Output inverts (toggles) when compare-match B occurs.
159
(Initial value)
(Initial value)
(Initial value)
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