68HC05CT4 datasheet(91/142 Pages) FREESCALE

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Dual Phase-Locked Loop (PLL)

Registers

MC68HC05CT4 — Rev. 2.0

General Release Specification

Dual Phase-Locked Loop (PLL)

11.3.4 16-Bit Receive Counter Modulus Register

This 2-byte register holds the count for the 16-bit receive counter. The

receive counter is shut off and held in reset when the RXON bit is

cleared. For proper operation, this register must not be loaded with a

value less than $000F.

The modulus registers mentioned above have specific read/write logic.

When the user updates the contents of the modulus registers, the MSB

must be written first and is temporarily stored in a temporary buffer. This

inhibits the transfer of data from this level to the next level, which is the

modulus register. When the LSB is written, all 12 or 16 bits (data from

the temporary buffer and the MCU internal bus) are transferred to the

modulus register simultaneously. This prevents the loading of bad data

from the modulus register. A read of the data registers is the reverse of

a write operation. A read of the LSB buffers the MSB. A subsequent read

of the MSB reflects this buffered value. Since only one temporary buffer

exists, two sequential MSB writes of different registers will result in only

the last data value stored in the temporary buffer. The first value will be

lost.

Address:

$000F

Bit 7

654321

Bit 0

Read:

PLLRX15 PLLRX14 PLLRX13 PLLRX12 PLLRX11 PLLRX10

PLLRX9

PLLRX8

Write:

Reset:

00000000

Address:

$0010

Bit 7

654321

Bit 0

Read:

PLLRX7

PLLRX6

PLLRX5

PLLRX4

PLLRX3

PLLRX2

PLLRX1

PLLRX0

Write:

Reset:

00000000

Figure 11-5. 16-Bit Receive Counter (PLLRX)

Freescale Semiconductor, Inc.

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