NEC uPD78056Y User Manual
Page 224
224
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 1 AND 2
Figure 9-4. Timer Clock Select Register 1 Format
Caution
When rewriting TCL1 to other data, stop the timer operation beforehand.
Remarks 1. f
XX
: Main system clock frequency (f
X
or f
X
/2)
2. f
X
: Main system clock oscillation frequency
3. TI1
: 8-bit timer register 1 input pin
4. TI2
: 8-bit timer register 2 input pin
5. MCS : Oscillation mode selection register (OSMS) bit 0
6. Figures in parentheses apply to operation with f
X
= 5.0 MHz
TCL17 TCL16 TCL15 TCL14 TCL13 TCL12 TCL11 TCL10
7
6
5
4
3
2
1
0
Symbol
TCL1
FF41H
00H
R/W
Address
After Reset
R/W
TCL13 TCL12 TCL11 TCL10
0
0
0
0
TI1 falling edge
0
0
0
1
TI1 rising edge
0
1
1
0
0
1
1
1
f
XX
/2
f
X
/2
(2.5 MHz)
f
X
/2
2
(1.25 MHz)
1
0
0
0
f
XX
/2
2
f
X
/2
2
(1.25 MHz)
f
X
/2
3
(625 kHz)
1
0
0
1
f
XX
/2
3
f
X
/2
3
(625 kHz)
f
X
/2
4
(313 kHz)
1
0
1
0
f
XX
/2
4
f
X
/2
4
(313 kHz)
f
X
/2
5
(156 kHz)
1
0
1
1
f
XX
/2
5
f
X
/2
5
(156 kHz)
f
X
/2
6
(78.1 kHz)
1
1
0
0
f
XX
/2
6
f
X
/2
6
(78.1 kHz)
f
X
/2
7
(39.1 kHz)
1
1
0
1
f
XX
/2
7
f
X
/2
7
(39.1 kHz)
f
X
/2
8
(19.5 kHz)
1
1
1
0
f
XX
/2
8
f
X
/2
8
(19.5 kHz)
f
X
/2
9
(9.8 kHz)
1
1
1
1
f
XX
/2
9
f
X
/2
9
(9.8 kHz)
f
X
/2
10
(4.9 kHz)
MCS = 1
8-Bit Timer Register 1 Count Clock Selection
MCS = 0
Other than above
Setting prohibited
f
XX
/2
11
f
X
/2
11
(2.4 kHz)
f
X
/2
12
(1.2 kHz)
TCL17 TCL16 TCL15 TCL14
0
0
0
0
TI2 falling edge
0
0
0
1
TI2 rising edge
0
1
1
0
0
1
1
1
f
XX
/2
f
X
/2
(2.5 MHz)
f
X
/2
2
(1.25 MHz)
1
0
0
0
f
XX
/2
2
f
X
/2
2
(1.25 MHz)
f
X
/2
3
(625 kHz)
1
0
0
1
f
XX
/2
3
f
X
/2
3
(625 kHz)
f
X
/2
4
(313 kHz)
1
0
1
0
f
XX
/2
4
f
X
/2
4
(313 kHz)
f
X
/2
5
(156 kHz)
1
0
1
1
f
XX
/2
5
f
X
/2
5
(156 kHz)
f
X
/2
6
(78.1 kHz)
1
1
0
0
f
XX
/2
6
f
X
/2
6
(78.1 kHz)
f
X
/2
7
(39.1 kHz)
1
1
0
1
f
XX
/2
7
f
X
/2
7
(39.1 kHz)
f
X
/2
8
(19.5 kHz)
1
1
1
0
f
XX
/2
8
f
X
/2
8
(19.5 kHz)
f
X
/2
9
(9.8 kHz)
1
1
1
1
f
XX
/2
9
f
X
/2
9
(9.8 kHz)
f
X
/2
10
(4.9 kHz)
MCS = 1
8-Bit Timer Register 2 Count Clock Selection
MCS = 0
Other than above
Setting prohibited
f
XX
/2
11
f
X
/2
11
(2.4 kHz)
f
X
/2
12
(1.2 kHz)