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S3C2440A RISC MICROPROCESSOR CLOCK & POWER MANAGEMENT
7-21
PLL CONTROL REGISTER (MPLLCON & UPLLCON)
Register Address R/W Description Reset Value
MPLLCON 0x4C000004 R/W MPLL configuration register 0x00096030
UPLLCON 0x4C000008 R/W UPLL configuration register 0x0004d030
PLLCON Bit Description Initial State
MDIV [19:12] Main divider control 0x96 / 0x4d
PDIV [9:4] Pre-divider control 0x03 / 0x03
SDIV [1:0] Post divider control 0x0 / 0x0
NOTE
When you set MPLL&UPLL values, you have to set the UPLL value first and then the MPLL value. (Needs intervals
approximately 7 NOP)
PLL VALUE SELECTION TABLE
It is not easy to find a proper PLL value. So, we recommend referring to the following PLL value recommendation
table.
Input Frequency Output Frequency MDIV PDIV SDIV
12.0000MHz
48.00 MHz
(Note)
56(0X38) 2 2
12.0000MHz
96.00 MHz
(Note)
56(0x38) 2 1
12.0000MHz
271.50 MHz 173(0xad) 2 2
12.0000MHz
304.00 MHz 68(0x44) 1 1
12.0000MHz
405.00 MHz 127(0x7f) 2 1
12.0000MHz
532.00 MHz 125(0x7d) 1 1
16.9344MHz
47.98 MHz
(Note)
60(0x3c) 4 2
16.9344MHz
95.96 MHz
(Note)
60(0x3c) 4 1
16.9344MHz
266.72
MHZ 118(0x76) 2 2
16.9344MHz
296.35
MHZ 97(0x61) 1 2
16.9344MHz 399.65 MHz 110(0x6e) 3 1
16.9344MHz 530.61 MHz 86(0x56) 1 1
16.9344MHz 533.43 MHz 118(0x76) 1 1
NOTE
The 48.00MHz and 96MHz output is used for UPLLCON register.