Z87001 Datasheet, PDF (43/51 Pages) Zilog, Inc. – ROMless Spread Spectrum Cordless Phone Controller

Zilog
Z87001/Z87L01
ROMless Spread Spectrum Cordless Phone Controller
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 PAON output pin
R
Returns 0
W
0 Active high
1 Active Low
RFTX_PWR_ON
-edcba98--------
Determines PAON 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 PAON 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 PAON 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.
DS96WRL0800
PRELIMINARY
43