M37160M8 Datasheet, PDF (46/131 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

M37160M8/MA/MF-XXXSP/FP,M37160EFSP/FP
Set “2C16” to DA-H register.
Set “2816” to DA-L register.
b7 b6 b5 b4 b3 b2 b1 b0
[DA-H 0 _{0 1 0 1 1 0 0} DH
register]
At writing of DA-L
b7 b6 b5 b4 b3 b2 b1 b0
[DA-L register]
1 0 1 0 0 0 DL
Undefined
At writing of DA-L
b13
b6 b5
b0
[DA latch] 0 0 1 0 1 1 0 0 1 0 1 0 0 0
“H” level area of
fundamental waveform
These bits decide “H” level area of
fundamental waveform.
=
Minimum
resolution bit
width 0.25 µs
✕ ^{High-order 8-bit}
value of DA latch
These bits decide smaller interval “tm” in which “H” leval
area is [“H” level area of fundamental waveform + t ].
Fundamental
waveform
0.25 µs ✕ 44
14-bit
PWM output ^{2C 2B 2A … 03 02 01 00}
8-bit
counter
FF FE FD ^… D6 D5 D4 D3 ^… 02 01 00
Fundamental waveform of smaller interval
“tm” which is not specified by low-order 6
bits is not changed.
0.25 µs ✕44
Waveform of smaller interval “tm” specified by low-order 6 bits
0.25 µs ✕45
14-bit
PWM output ^{2C 2B 2A … 03 02 01 00}
0.25 µs
8-bit
counter
FF FE FD ^… D6 D5 D4 D3 ^… 02 01 00
t = 0.25 µs
14-bit PWM output
Low-order 6-bit output
of DA latch
t0
t1
t2
t3
t4
t5
t59 t60 t61 t62 t63
Repeat period
T = 4096 µs
Fig. 8.7.3 14-bit PWM Output Example (f(XIN) = 8MHz)
Rev.1.01 2003.11.13 page 46 of 130