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.
Summary of Contents for DragonBall MC9328MX1
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Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
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Page 126: ...4 10 MC9328MX1 Reference Manual MOTOROLA ARM920T Processor ...
Page 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
Page 272: ...13 32 MC9328MX1 Reference Manual MOTOROLA DMA Controller ...
Page 281: ...Programming Model MOTOROLA Watchdog Timer Module 14 9 ...
Page 282: ...14 10 MC9328MX1 Reference Manual MOTOROLA Watchdog Timer Module ...
Page 300: ...15 18 MC9328MX1 Reference Manual MOTOROLA Analog Signal Processor ASP ...
Page 438: ...18 16 MC9328MX1 Reference Manual MOTOROLA Serial Peripheral Interface Modules SPI 1 and SPI 2 ...
Page 478: ...19 40 MC9328MX1 Reference Manual MOTOROLA LCD Controller ...
Page 574: ...21 32 MC9328MX1 Reference Manual MOTOROLA Memory Stick Host Controller MSHC Module ...
Page 598: ...23 16 MC9328MX1 Reference Manual MOTOROLA Real Time Clock RTC ...
Page 670: ...24 72 MC9328MX1 Reference Manual MOTOROLA SDRAM Memory Controller ...
Page 726: ...25 56 MC9328MX1 Reference Manual MOTOROLA SmartCard Interface Module SIM ...
Page 736: ...26 10 MC9328MX1 Reference Manual MOTOROLA General Purpose Timers ...
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Page 900: ...30 46 MC9328MX1 Reference Manual MOTOROLA Synchronous Serial Interface SSI ...
Page 942: ...32 26 MC9328MX1 Reference Manual MOTOROLA GPIO Module and I O Multiplexer IOMUX ...