NEC NEC PD78081(A), User Manual

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86
CHAPTER 6 8-BIT TIMER/EVENT COUNTERS 5 AND 6
(2) Timer clock select register 6 (TCL6)
This register sets count clocks of 8-bit timer register 6.
TCL6 is set with an 8-bit memory manipulation instruction.
RESET input sets TCL6 to 00H.
Figure 6-4. Timer Clock Select Register 6 Format
Note When clock is input from the external, timer output (PWM output) cannot be used.
Caution When rewriting TCL6 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. TI6 : 8-bit timer register 6 input pin
4. MCS : Oscillation mode selection register (OSMS) bit 0
5. Values in parentheses when operated at f
X
= 5.0 MHz
0 0 0 0 TCL63 TCL62 TCL61 TCL60
7 6 5 4 3 2 1 0 Symbol
TCL6
TCL63 TCL62 TCL61 TCL60
0 0 0 0 TI6 falling edge
Note
0 0 0 1 TI6 rising edge
Note
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
MCS=1
8-bit Timer Register 6 Count Clock Selection
MCS=0
Other than above Setting prohibited
FF56H 00H
Address After Reset
2f
XX
Setting prohibited f
X
(5.0 MHz)
f
XX
f
X
(5.0 MHz) f
X
/2 (2.5 MHz)
f
XX
/2 f
X
/2 (2.5 MHz) f
X
/2
2
(1.25 MHz)
f
XX
/2
2
f
X
/2
2
(1.25 MHz) f
X
/2
3
(625 kHz)
f
XX
/2
3
f
X
/2
3
(625 kHz) f
X
/2
4
(313 kHz)
f
XX
/2
4
f
X
/2
4
(313 kHz) f
X
/2
5
(156 kHz)
f
XX
/2
5
f
X
/2
5
(156 kHz) f
X
/2
6
(78.1 kHz)
f
XX
/2
6
f
X
/2
6
(78.1 kHz) f
X
/2
7
(39.1 kHz)
f
XX
/2
7
f
X
/2
7
(39.1 kHz) f
X
/2
8
(19.5 kHz)
f
XX
/2
8
f
X
/2
8
(19.5 kHz) f
X
/2
9
(9.8 kHz)
f
XX
/2
9
f
X
/2
9
(9.8 kHz) f
X
/2
10
(4.9 kHz)
f
XX
/2
11
f
X
/2
11
(2.4 kHz) f
X
/2
12
(1.2 kHz)