22-6
MC9328MX1 Reference Manual
MOTOROLA
Pulse-Width Modulator (PWM)
Note: Only the lower 16 bits are passed to PWM 16-bit FIFO after swapping.
22.4.2 PWM Sample Register
The PWM Sample Register is the input to the FIFO. Writing successive audio sample values to this
register automatically loads the values into the FIFO. The pulse-width modulator free-runs at the last set
duty-cycle setting until the FIFO is reloaded or the pulse-width modulator is disabled. If the value in this
register is higher than the 1, the output is never reset, which results in a 100% duty-cycle.
The register bit assignments are shown in the following register display. The register settings are described
in Table 22-5.
Table 22-4. HCTR and BCTR Bit Swapping
HCTR
BCTR
Swapping
0
0
No
0
1
Swapping bits[15:8] to bits[7:0] and bits[7:0] to bits[15:8]
1
0
Swapping bits[31:16] to bits[15:0] and bits[15:0] to bits[31:16]
1
1
Swapping bit[s31:16] to bits[15:0] and bits[15:0] to bits[15:0] to bits[31:16], and after that
swapping bits[15:8] to bits[7:0] and bits[7:0] to bits[15:8]
PWMS
PWM Sample Register
Addr
0x00208004
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SAMPLE
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0xXXXX
Table 22-5. PWM Sample Register Description
Name
Description
Reserved
Bits 31–16
Reserved—These bits are reserved and should read 0.
SAMPLE
Bits 15–0
Sample
—Contains a two-sample word. This word is written to the pulse-width modulator.
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