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Z87000

SPREAD SPECTRUM CONTROLLERS

Zilog 

Zilog

Z87000/Z87L00

Spread Spectrum Controllers

Table 27. Bank 2 Register Description

RFTX_PWR_CTRL Bank 2

EXT7

Field

Bit Position

R/W Data

Description

1

RFTX_POLARITY

f---------------

Controls the polarity of the RFTX output pin

R

Returns 0

W

0 Active high

1 Active Low

RFTX_PWR_ON

-edcba98--------

Determines RFTX output pin turn-on time

referenced to the transmit frame counter

R

Returns 0

W xXh Bits 6-0 of turn-on time (=(x modulo 128) -1)

RESERVED

RFTX_PWR_OFF

--------7------- R

W

---------6543210

R

W

Returns 0

No effect

Determine RFTX output pin turn-off time

referenced to the transmit frame counter

Returns 0

xXh Bits 6-0 of turn-off time (=(x modulo 128) -1)

Notes:

1. RFTX_PWR_ON, RFTX_PWR_OFF. Controls the RFTX output pin, and thereby the external RF module’s transmitter. The

turn-on and off times are given in number of transmitted bit periods and are referenced to the transmit Frame Counter. Only

the 7 LSBits of the 9-bit value are programmable. The two MSBits have fixed values which depend on whether base station

or handset is selected. For RFTX_PWR_ON, the two bits are “00” on the base and “01” on the handset. For

RFTX_PWR_OFF, the two bits are “01” on the base and “10” on the handset.

2. Changes to these values take effect immediately.

3. To disable the transmitter continuously, clear TX_ENABLE in SSP_STATE.

DS96WRL0501

PRELIMINARY

1-43

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