NEC uPD78078Y Manuale Utente
254
CHAPTER 10 8-BIT TIMER/EVENT COUNTERS 5 AND 6
10.3 8-Bit Timer/Event Counters 5 and 6 Control Registers
The following three types of registers are used to control the 8-bit timer/event counters 5 and 6.
• Timer clock select register 5 and 6 (TCL5, TCL6)
• 8-bit timer mode control registers 5 and 6 (TMC5, TMC6)
• Port mode register 10 (PM10)
(1) Timer clock select register 5 (TCL5)
This register sets count clocks of 8-bit timer register 5.
TCL5 is set with an 8-bit memory manipulation instruction.
RESET input sets TCL5 to 00H.
Figure 10-3. Timer Clock Select Register 5 Format
Note
When clock is input from the external, timer output (PWM output) cannot be used.
Caution When rewriting TCL5 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. TI5
: 8-bit timer register 5 input pin
4. MCS : Bit 0 of oscillation mode selection register (OSMS)
5. Figures in parentheses apply to operation with f
X
= 5.0 MHz.
0
0
0
0
TCL53 TCL52 TCL51 TCL50
7
6
5
4
3
2
1
0
Symbol
TCL5
TCL53 TCL52 TCL51 TCL50
0
0
0
0
TI5 falling edge
Note
0
0
0
1
TI5 rising edge
Note
0
1
0
0
f
XX
f
X
(Setting prohibited)
f
X
/2
(2.5 MHz)
0
1
0
1
f
XX
/2
f
X
/2
(2.5 MHz)
f
X
/2
2
(1.25 MHz)
0
1
1
0
f
XX
/2
2
f
X
/2
2
(1.25 MHz)
f
X
/2
3
(625 kHz)
0
1
1
1
f
XX
/2
3
f
X
/2
3
(625 kHz)
f
X
/2
4
(313 kHz)
1
0
0
0
f
XX
/2
4
f
X
/2
4
(313 kHz)
f
X
/2
5
(156 kHz)
1
0
0
1
f
XX
/2
5
f
X
/2
5
(156 kHz)
f
X
/2
6
(78.1 kHz)
1
0
1
0
f
XX
/2
6
f
X
/2
6
(78.1 kHz)
f
X
/2
7
(39.1 kHz)
1
0
1
1
f
XX
/2
7
f
X
/2
7
(39.1 kHz)
f
X
/2
8
(19.5 kHz)
1
1
0
0
f
XX
/2
8
f
X
/2
8
(19.5 kHz)
f
X
/2
9
(9.8 kHz)
1
1
0
1
f
XX
/2
9
f
X
/2
9
(9.8 kHz)
f
X
/2
10
(4.9 kHz)
1
1
1
0
f
X
/2
11
1
1
1
1
f
XX
/2
11
f
X
/2
11
(2.4 kHz)
(1.2 kHz)
MCS = 1
8-bit Timer Register 5 Count Clock Selection
MCS = 0
Other than above
Setting prohibited
FF52H
00H
R/W
Address
After Reset
R/W
2f
XX
(5.0 MHz)
f
X
(5.0 MHz)