PC87591L datasheet(245/437 Pages) NSC

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Embedded Controller Modules (Continued)

Revision 1.07

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HFCGM Low Value Register (HFCGML)

The HFCGML register contains the lower eight bits of the frequency multiplier M value. Data written to the register is stored

in the setup buffer. Reading the register returns the HFCGML value of the currently set frequency. On VCC power-up,

WATCHDOG reset and Debugger Interface reset, it is loaded with CF16.

Location: 00 FFA216

Type: R/W

HFCGM High Value Register (HFCGMH)

The HFCGMH register contains the upper bits of the frequency multiplier M value. Data written to the register is stored in

the setup buffer. Reading the register returns the HFCGMH value of the currently set frequency. On VCC power-up, WATCH-

DOG reset and Debugger Interface reset, it is loaded with 0316.

Location: 00 FFA416

Type: R/W

HFCGN Value Register (HFCGN)

The HFCGN register is a byte-wide, read/write register containing five bits of the frequency multiplier N value. Data written to the

register is stored in the setup buffer. Reading the register returns the HFCGN value of the currently set frequency. On VCC

power-up, WATCHDOG reset and Debugger Interface reset, it is loaded with 0816.

Location: 00 FFA616

Type: R/W

Bit

76543210

Name

HFCGM7-0

Reset

11001111

Bit

Description

7-0

HFCGM7-0. Contains the lower eight bits of the M value.

Bit

76543210

Name

HFCGM

Reset

00000011

Bit

Description

7-0

HFCGM. Contains the upper bits of the M value.

Bit

76543210

Name

Reserved

HFCGN4-0

Reset

00001000

Bit

Description

4-0

HFCGN4-0. Contains the five bits of the N value.

7-5

Reserved.

PC87591L Datasheet(PDF) 245 Page - National Semiconductor (TI)

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