Z87001 Datasheet, PDF (38/51 Pages) Zilog, Inc. – ROMless Spread Spectrum Cordless Phone Controller

Z87001/Z87L01
ROMless Spread Spectrum Cordless Phone Controller
REGISTER DESCRIPTION (Continued)
Zilog
Table 15. Bank 3 Register Description
SSPSTATUS
Field
Bank 3
Bit Position
EXT3
R/W Data
Description
FRAME_COUNTER fedcba987------
R
W
Current frame counter value
00h First value at beginning of frame (0)
...
173h Last value at end of frame (371)
... Illegal values
No effect
RESERVED
HAND_BASE_SEL
---------65---- R
W
-----------4---
R
W
Returns 0
No effect
Reflects status of Handset/Base select pin (HBSW)
0 Base (HBSW = 0)
1 Handset (HBSW = 1)
No effect
SYNC_ACQ_IND
------------3--
R
W
FRAME_START_IND ------------2--
R
W
Indicates detection of a Sync word (UW or SYNC_D
depending on SYNC_SEARCH_WORD search mode)
0 No sync word detected
1 Sync word detected
No effect
Indicates start of a new frame
0 No start of new frame (1 written to
1 FRAME_START_CLR)
New frame started
No effect
RESERVED
-------------10 R
W
Returns 0
No effect
Notes:
FRAME_COUNTER. Read the double-buffered current value of the Frame Counter.
On the handset, a single frame counter is used to clock transmit and receive events.
On the base station, the transmit frame counter value is returned
GPIO0DIR
Field
DIRECTION0
Table 16. Bank 3 Register Description
Bit 3
Bit Position
fedcba9876543210
EXT4
R/W
R/W
Data Description
Independent control of Port 0 pin direction
..0. Sets pin in input mode
..1. Sets pin in output mode
38
PRELIMINARY
DS96WRL0800