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M38B71M1 Datasheet(PDF) 64 Page - Renesas Technology Corp

Part No. M38B71M1
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M38B71M1 Datasheet(HTML) 64 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
63
15.75
µs
64
µs
64
µs64 µs64 µs
64
µs
m = 0
m = 7
m = 8
m = 9
m = 63
16.0
µs
15.75
µs15.75 µs
15.75
µs15.75 µs15.75 µs
Pulse width modulation register H: 00111111
Pulse width modulation register L: 000101
Sub-periods where “H” pulse width is 16.0
µs: m = 8, 24, 32, 40, 56
Sub-periods where “H” pulse width is 15.75
µs: m = all other values
4096
µs
Data Setup
The PWM output pin also function as port P96. Set port P96 to be
the PWM output pin by setting bit 0 of the PWM control register
(address 002616) to “1”. The high-order 8 bits of output data are
set in the high-order PWM register PWMH (address 003516) and
the low-order 6 bits are set in the low-order PWM register PWML
(address 003616).
PWM Operation
The timing of the 14-bit PWM function is shown in Figure 65.
The 14-bit PWM data is divided into the low-order 6 bits and the
high-order 8 bits in the PWM latch.
The high-order 8 bits of data determine how long an “H” level sig-
nal is output during each sub-period. There are 64 sub-periods in
each period, and each sub-period t is 256 ✕
τ (= 64 µs) long. The
signal’s “H” has a length equal to N times
τ, and its minimum reso-
lution = 250 ns.
The last bit of the sub-period becomes the ADD bit which is speci-
fied either “H” or “L,” by the contents of PWML. As shown in Table
11, the ADD bit is decided either “H” or “L.”
That is, only in the sub-period tm shown in Table 11 in the PWM
cycle period T = 64 t, the “H” duration is lengthened during the
minimum resolution width
τ period in comparison with the other
period.
For example, if the high-order eight bits of the 14-bit data are
“0316” and the low-order six bits are “0516,” the length of the “H”
level output in sub-periods t8, t24, t32, t40 and t56 is 4
τ, and its
length 3
τ in all other sub-periods.
Time at the “H” level of each sub-period almost becomes equal
because the time becomes length set in the high-order 8 bits or
becomes the value plus t, and this sub-period t (= 64
µs, approxi-
mate 15.6 kHz) becomes cycle period approximately.
Table 11 Relationship between low-order 6-bit data and setting
period of ADD bit
0 0 0 0 0 0
None
0 0 0 0 0 1
m = 32
0 0 0 0 1 0
m = 16, 48
0 0 0 1 0 0
m = 8, 24, 40, 56
0 0 1 0 0 0
m = 4, 12, 20, 28, 36, 44, 52, 60
0 1 0 0 0 0
m = 2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62
1 0 0 0 0 0
m = 1, 3, 5, 7, .................................................., 57, 59, 61, 63
LSB
Sub-periods tm lengthened (m = 0 to 63)
Low-order
6-bit data
Transfer From Register to Latch
Data written to the PWML register is transferred to the PWM latch
once in each PWM period (every 4096
µs), and data written to the
PWMH register is transferred to the PWM latch once in each sub-
period (every 64
µs). Pulses output from the PWM output pin
correspond to this latch contents.
When the PWML register is read, the contents of the latch are
read. However, bit 7 of the PWML register indicates whether the
transfer to the PWM latch is completed: the transfer is completed
when bit 7 is “0”, it is not done when bit 7 is “1”.
Fig. 65 PWM timing


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