12-8
MC9328MX1 Reference Manual
MOTOROLA
Phase-Locked Loop and Clock Controller
12.5.2 Peripheral Clock Divider Register
Each peripheral module in the MC9328MX1 uses clock signals from one of the three clock sources shown
in Table 12-6. The three peripheral clock dividers (PCLKDIV1, PCLKDIV2, PCLKDIV3) provide
flexible clock configuration capability so that a minimum set of clock frequencies can satisfy a large group
of modules to achieve better power efficiency.
Table 12-6. Clock Sources for Peripherals
Clock Source
Peripheral
PERCLK1
UART1, UART2, Timer1, Timer2, PWM
PERCLK2
ASP, LCD, SD, SIM, SPI 1, SPI 2
PERCLK3
SSI
HCLK
SDRAM, CSI, Memory Stick, I
2
C, DMA
PCDR
Peripheral Clock Divider Register
Addr
0x0021B020
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
PCLK_DIV3
TYPE
r
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
0x000B
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
PCLK_DIV2
PCLK_DIV1
TYPE
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
1
0
1
1
1
0
1
1
0x00BB
Table 12-7. Peripheral Clock Divider Register Description
Name
Description
Settings
Reserved
Bits 31
–
23
Reserved—These bits are reserved and should read 0.
PCLK_DIV3
Bits 22
–
16
Peripheral Clock Divider 3
—Contains the 7-bit integer divider that
produces the PERCLK3 clock signal for the peripherals. The input to
the PCLK_DIV3 divider circuit is System PLLCLK.
0000000 = Divide by 1
0000001 = Divide by 2
…
1111111 = Divide by 128
Reserved
Bits 15
–
8
Reserved—These bits are reserved and should read 0.
PCLK_DIV2
Bits 7
–
4
Peripheral Clock Divider 2
—Contains the 4-bit integer divider that
produces the PERCLK2 clock signal for the peripherals. The input to
the PCLK_DIV2 divider circuit is System PLLCLK.
0000 = Divide by 1
0001 = Divide by 2
…
1111 = Divide by 16
Summary of Contents for DragonBall MC9328MX1
Page 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
Page 116: ...3 30 MC9328MX1 Reference Manual MOTOROLA Memory Map ...
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 ...
Page 854: ...29 18 MC9328MX1 Reference Manual MOTOROLA I2C Module ...
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 ...