MC68HC908GR4MP datasheet(83/286 Pages) FREESCALE

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CGMC Registers

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

Freescale Semiconductor

7.5.3 PLL Multiplier Select Register High

The PLL multiplier select register high (PMSH) contains the programming information for the high byte of

the modulo feedback divider.

MUL11–MUL8 — Multiplier Select Bits

These read/write bits control the high byte of the modulo feedback divider that selects the VCO

frequency multiplier N. (See 7.3.3 PLL Circuits and 7.3.6 Programming the PLL.) A value of $0000 in

the multiplier select registers configures the modulo feedback divider the same as a value of $0001.

Reset initializes the registers to $0040 for a default multiply value of 64.

NOTE

The multiplier select bits have built-in protection such that they cannot be

written when the PLL is on (PLLON = 1).

PMSH[7:4] — Unimplemented Bits

These bits have no function and always read as logic 0s.

7.5.4 PLL Multiplier Select Register Low

The PLL multiplier select register low (PMSL) contains the programming information for the low byte of

the modulo feedback divider.

MUL7–MUL0 — Multiplier Select Bits

These read/write bits control the low byte of the modulo feedback divider that selects the VCO

frequency multiplier, N. (See 7.3.3 PLL Circuits and 7.3.6 Programming the PLL.) MUL7–MUL0 cannot

be written when the PLLON bit in the PCTL is set. A value of $0000 in the multiplier select registers

configures the modulo feedback divider the same as a value of $0001. Reset initializes the register to

$40 for a default multiply value of 64.

NOTE

The multiplier select bits have built-in protection such that they cannot be

written when the PLL is on (PLLON = 1).

Address:

$0038

Bit 7

654321

Bit 0

Read:

0000

MUL11

MUL10

MUL9

MUL8

Write:

Reset:

00000000

= Unimplemented

Figure 7-6. PLL Multiplier Select Register High (PMSH)

Address:

$0038

Bit 7

654321

Bit 0

Read:

MUL7

MUL6

MUL5

MUL4

MUL3

MUL2

MUL1

MUL0

Write:

Reset:

01000000

Figure 7-7. PLL Multiplier Select Register Low (PMSL)

MC68HC908GR4MP Datasheet(PDF) 83 Page - Freescale Semiconductor, Inc

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