M68ICS08GR datasheet(115/408 Pages) FREESCALE

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Clock Generator Module (CGMC)

CGMC Registers

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Clock Generator Module (CGMC)

115

7.6.1 PLL Control Register

The PLL control register (PCTL) contains the interrupt enable and flag

bits, the on/off switch, the base clock selector bit, the prescaler bits, and

the VCO power-of-two range selector bits.

PLLIE — PLL Interrupt Enable Bit

This read/write bit enables the PLL to generate an interrupt request

when the LOCK bit toggles, setting the PLL flag, PLLF. When the

AUTO bit in the PLL bandwidth control register (PBWC) is clear,

PLLIE cannot be written and reads as logic 0. Reset clears the PLLIE

bit.

$003A

PLL VCO Select Range

Read:

VRS7

VRS6

VRS5

VRS4

VRS3

VRS2

VRS1

VRS0

Write:

Reset:

01000000

$003B

PLL Reference Divider

Select Register (PMDS)

Read:

0000

RDS3

RDS2

RDS1

RDS0

Write:

Reset:

00000001

= Unimplemented

= Reserved

NOTES:

1. When AUTO = 0, PLLIE is forced clear and is read-only.

2. When AUTO = 0, PLLF and LOCK read as clear.

3. When AUTO = 1, ACQ is read-only.

4. When PLLON = 0 or VRS7:VRS0 = $0, BCS is forced clear and is read-only.

5. When PLLON = 1, the PLL programming register is read-only.

6. When BCS = 1, PLLON is forced set and is read-only.

Figure 7-3. CGMC I/O Register Summary

Address:

$0036

Bit 7

654321

Bit 0

Read:

PLLIE

PLLF

PLLON

BCS

PRE1

PRE0

VPR1

VPR0

Write:

Reset:

00100000

= Unimplemented

Figure 7-4. PLL Control Register (PCTL)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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