Z87100 Datasheet, PDF (10/48 Pages) Zilog, Inc. – Wireless Transmitter

Z87100
Wireless Transmitter
PIN FUNCTIONS (Continued)
Port 2 (P27-P20). Port 2 is an 8-bit, bidirectional, CMOS
compatible I/O port. These 8 I/O lines can be configured
under software control to be an input or output, indepen-
dently. Input buffers are Schmitt-triggered. Pins pro-
grammed as outputs may be globally programmed as ei-
ther push-pull or open-drain (Figure 6). In addition, when
Zilog
the PN modulator is enabled, and the appropriate pins are
programmed as outputs, P20 may be programmed as the
unspread data-out from the PN modulator. To provide a
monitor of this unspread data signal, P27 may similarly be
programmed as the data clock output.
P20 IN
Open-Drain
PN _ ENABLE (PNCON1 D0)
PNDOUT _ ENABLE (PNCON D4)
PNDOUT
P20 OUT
P20 OE
MUX
P20
PAD
P27 IN
Open-Drain
PN _ ENABLE (PNCON1 D0)
PNDCLKOUT _ ENABLE (PNCON1 D5)
PNDCLKOUT
P27 OUT
P27 OE
MUX
Figure 6. Port 2 Configuration (P20-P27)
P27
PAD
3-10
PRELIMINARY
DS96WRL0700