R8C/10 Group
Rev.1.20 Jan 27, 2006 page 65 of 180
REJ09B0019-0120
12.2 Timer Y
Timer Y is an 8-bit timer with an 8-bit prescaler and has two reload registers-Timer Y Primary and Timer
Y Secondary. Figure 12.11 shows a block diagram of Timer Y. Figures 12.12 to 12.14 show the TYZMR,
PREY, TYSC, TYPR, TYZOC, PUM, and YCSS registers.
The Timer Y has two operation modes as follows:
• Timer mode: The timer counts an internal count source.
• Programmable waveform generation mode: The timer outputs pulses of a given width successively.
Figure 12.11 Timer Y Block Diagram
Figure 12.12 TYZMR Register
Toggle
flip-flop
Timer Y interrupt
INT2 interrupt
TYPR register
f
1
f
8
Q
CK
f
RING
TYSC register
TYOCNT=1
TYOPL=1
Q
TYOPL=0
P3_2 bit in P3 register
TYOCNT=0TYMOD0=1
TYS=1
PREY register
INT
2
/CNTR
1
TYCK1 to TYCK0
=00
2
=01
2
=10
2
=11
2
Counter
Reload register
Counter
Reload register
Peripheral data bus
Reload register
Polarity
switching
CLR
Write to TYZMR register
TYMOD0 bit=1
T
i
m
e
r
Y
,
Z
m
o
d
e
r
e
g
i
s
t
e
r
Symbol Address After reset
TYZMR 0080
16
00
16
B
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n
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F
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t
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nB
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m
b
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7
6
5
4
3
2
1
0
0
0
:
T
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0
1
:
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S
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W
C
TYMOD0
T
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T
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0 : Timer mode
1 : Programmable waveform generation mode
T
Z
W
C
T
Z
S
0
:
S
t
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p
s
c
o
u
n
t
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g
1
:
S
t
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s
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n
t
i
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g
0
:
S
t
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p
s
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n
t
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g
1
:
S
t
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c
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g
T
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m
e
r
Z
c
o
u
n
t
s
t
a
r
t
f
l
a
g
Timer Z operation
mode bit
b
5
b
4
Timer Y count
start flag
T
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r
Z
w
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RW
R
R
R
R
R
R
R
R
R
1
E
D
G
0
:
R
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1
:
F
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I
N
T
2
/
C
N
T
R
1
p
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s
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12.2 Timer (Timer Y)
(11 pages)
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