Z87001 Datasheet, PDF (42/51 Pages) Zilog, Inc. – ROMless Spread Spectrum Cordless Phone Controller

Z87001/Z87L01
ROMless Spread Spectrum Cordless Phone Controller
Zilog
REGISTER DESCRIPTION (Continued)
Table 26. Bank 2 Register Description
DEMOD_PWR_CTRL Bank 2
Field
Bit Position
EXT6
R/W Data
Description
RFEON_POLARITY f---------------
R
W
Controls the polarity of the RFEON output pin
Returns 0
0 Active high
1 Active Low
DEMOD_PWR_ON
-edcba98--------
Determines internal power up of demodulator and turn
on time of RXSW pin, referenced to the receive frame
counter
R
Returns 0
W xXh Bits 6-0 of turn-on time (=(x modulo 128) -1)
RESERVED
--------7------- R
W
Returns 0
No effect
DEMOD_PWR_OFF ---------6543210
Determine internal power down of demodulator and
turn off time of RXSW pin, referenced to the receive
frame counter
R
Returns 0
W XXh Bits 6-0 of turn-off time (=(x modulo 128) -1)
Notes:
1. DEMOD_PWR_ON, DEMOD_PWR_OFF. Controls internal receive hardware and the RXSW output pin. The turn-on and off times
are given in number of received bit periods and are referenced to the Receive 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
DEMOD_PWR_ON, the two bits are “01” on the base and “00” on the handset. For DEMOD_PWR_OFF, the two bits are “10” on
the base and “01” on the handset
2. Changes to these values take effect immediately.
3. To enable receive power continuously, clear TX_ENABLE and set SYNC_SEARCH_MODE to FULL_SEARCH (this is the case
in acquisition mode).
4. The polarity of the RXSW output pin is controlled by the RFRX_POLARITY bit in the RFRX_PWR_CTRL register
.
42
PRELIMINARY
DS96WRL0800