Z87001 Datasheet, PDF (48/51 Pages) Zilog, Inc. – ROMless Spread Spectrum Cordless Phone Controller

Z87001/Z87L01
ROMless Spread Spectrum Cordless Phone Controller
Zilog
Table 36. Bank 0 Register Description
RFRX_PWR_CTRL
Field
Bank 0
Bit Position
EXT7
R/W Data
Description
RFRX_POLARITY
RFRX_PWR_ON
RESERVED
RFRX_PWR_OFF
f---------------
-edcba98--------
--------7-------
---------6543210
Controls the polarity of the TXSW (and RXSW)
output pins
R
Returns 0
W
0 TXSW active Low and RXSW active High
1 TXSW active High and RXSW active Low
Determines TXSW 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)
R
Returns 0
W
No effect
Determine TXSW output pin turn-off time
referenced to the transmit frame counter
R
Returns 0
W xXh Bits 6-0 of turn-off time (=(x modulo 128) -1)
Notes:
1. RFRX_POLARITY. Caution: notice the inverse polarity of the TXSW pin.
2. RFRX_PWR_ON, RFRX_PWR_OFF. Controls the TXSW output pin. The turn-on and off times are given in number of trans-
mitted bit periods and are referenced to the TRANSMIT (!) Frame Counter. Only the 7 LSBits of the 9-bit value are program-
mable. The two MSBits have fixed values which depend on whether base station or handset is selected. For
RFRX_PWR_ON, the two bits are “00” on the base and “01” on the handset. For RFRX_PWR_OFF, the two bits are “01”
on the base and “10” on the handset.
3. Changes to these values take effect immediately.
4. To disable transmit power continuously, clear TX_ENABLE.
48
PRELIMINARY
DS96WRL0800