PULSE OUTPUT PORT MODE
9.4 Setting of pulse output port mode
Continued from preceding Figure 9.4.3.
Registers used in pulse output port 1
When pulse width modulation is not performed
When pulse width modulation is performed
b7
b0
Timer Aj mode register (j = 1, 2, 4) (Addresses 5716, 5816, 5A16
)
0
1
1
Timer Ak mode register
(k = 6, 7, 9)
(Addresses D716, D816, DA16
0
j = 1, 2 : Fix this bit to “0.
j = 4 : When not using pin TA4OUT (in other words, when using pin
)
P20 as a programmable I/O port pin), clear this bit to “0.”
16/8-bit PWM mode select bit
0 : 16-bit pulse width modulator
1 : 8-bit pulse width modulator
Count source select bit
See Table 7.2.3.
Setting of PWM pulse period and “H” level width
✽✽
When 16-bit pulse width modulator
(b15)
b7
(b8)
b0 b7
b0
Timer A6 register (Addresses C916, C816
Timer A7 register (Addresses CB16, CA16
Timer A9 register (Addresses CF16, CE16
)
)
)
Timer A1 register (Addresses 4916, 4816
Timer A2 register (Addresses 4B16, 4A16
Timer A4 register (Addresses 4F16, 4E16
)
)
)
A value in the range from “000016” to “FFFE16 ” (n) is set.
✽✽When 8-bit pulse width modulator
(b15)
b7
(b8)
b0 b7
b0
Timer A6 register (Addresses C916, C816
Timer A7 register (Addresses CB16, CA16
)
)
Timer A1 register (Addresses 4916, 4816
Timer A2 register (Addresses 4B16, 4A16
)
)
Timer A9 register (Addresses CF16, CE16
)
Timer A4 register (Addresses 4F16, 4E16
)
A value in the range from “0016” to “FF16” (m) is set.
A value in the range from “0016” to “FE16” (n) is set.
✽ When operating as 8-bit pulse width modulator
✽ When operating as 16-bit pulse width modulator
(m + 1)(28– 1)
216 – 1
Period =
Period =
f
i
fi
n (m + 1)
n
“H” level width =
: Frequency of count source
“H” level width =
fi
f
i
fi
fi : Frequency of count source
However, if n = “0016,” the pulse width modulator
does not operate and pin TAjOUT pin outputs “L”
level. At this time, no timer Aj interrupt request
occurs.
However, if n = “000016,” the pulse width modulator
does not operate and pin TAjOUT pin outputs “L”
level. At this time, no timer Aj interrupt request
occurs.
Continued on Figure 9.4.5.
Fig. 9.4.4 Initial setting example for registers relevant to pulse output port 0 (pulse mode 1) (4)
7905 Group User’s Manual Rev.1.0
9-29
RENESAS [ RENESAS TECHNOLOGY CORP ]
