--------------------------------------------------------------HD614P080S
Table 12. Timer Mode Register B
TMB
Bit
3
Auto-reload Function
o
No
Yes
TMB
Prescaler Divide Ratio,
Bit
2
Bit
1
Bit
0
Clock
Input
Source
0 0
0
72048
0
0
1
512
0 1
0
128
0
1
1
32
1
0
0
8
1
0
1
4
1 1
0
2
1 1
1
INTI
(External Event Input)
• TIMER-B
(TCBl:
$OOA,
TCBU:
$OOB)
TlRl:
$OOA,
TlRU:
$OOB
T1MER-B consists
of
an 8-bit write-only Timer Load Regis-
ter,
and
an
8-bit read-only Timer/Event
Counter.
Each
of
them
has a low-order digit
(TCBL:
$OOA,
TLRL:
$OOA)
and
a high-
order
digit (TCBU:
$OOB,
TLRU:
$OOB).
The Timer/Event
Counter
can be initialized by writing data
into
the
Timer
Load Register. In this case, write
the
low-order
digit first, and then
the
high-order digit.
The
Timer/Event
Counter
is initialized at the time when the high-order digit
is
written.
The Timer Load Register will be initialized to
$00
by
the
MCU
reset.
The
counter
value
of
T1MER-B can be
obtained
by
reading
PMR:$
004
the
Timer/Event
Counter.
In this case, read
the
high-order digit
first,
and
then
the
low-order digit. The
count
value
oflow-order
digit
is
latched
at
the time when the high-order digit is read.
• TIMER-A
Interrupt
Request Flag
(lFTA:
$001,2)
The
TIMER-A
Interrupt
Request Flag
is
set
by
the
overflow
output
of
TIMER-A.
• TIMER-A
Interrupt
Mask
(lMTA:
$001,3)
TIMER-A
Interrupt
Mask prevents
an
interrupt
request
generated
by
T1MER-A
Interrupt
Request Flag.
Table 13.
TIMER-A
Interrupt Request Flag
TIMER-A
Interrupt
Request Flag
o
Interrupt
Request
No
Yes
Table 14.
TIMER-A
Interrupt
Mask
TIMER-A
Interrupt
Mask
o
Interrupt
Request
Enable
Disable (Mask)
• TIMER-B
Interrupt
Request Flag
(lFTB:
$002,0)
The
TIMER-B
Interrupt
Request Flag
is
set
by
the
overflow
output
of
TIMER-B.
• TIMER-B
Interrupt
Mask
(lMTB:
$002, 1)
TIMER-B
Interrupt
Mask prevents
an
interrupt
request
generated
by
T1MER-B
Interrupt
Request Flag.
SMR:$
005
Transfer
clock
selection
R.o/SCK
pin
mode selection
'-------
R.
2
/S0
pin
mode selection
L-
_______
R.,/SI
pin
mode selection
L-
__________
R.
2
/INT
o
pin
mode selection
'--------------
Rll/lNT,
pin
mode selection
TMA:$
008
TMB:$009
I><ITMA21TMA
11™AOI
· '
l'
L
TlMER-B
input
clock selection
f l Auto-reload
function
selection
~
TlMER-A
mput
clock
selection
Fig.
14
Mode Register Configuration
and
Function
277
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