Z8E520 Datasheet, PDF (17/43 Pages) Zilog, Inc. – 1.5 MBPS USB Device Controller

Zilog
Z8E520/C520
1.5 MBPS USB Device Controller
Port B. Port B (6–7) is configured as a serial communica- Port B (6) has a programmable internal pullup of 7.5 K ±
tion port as follows:
30%. For USB Mode, Port B (7) requires an external pullup
USB
PS/2 RS232 GPIO
of 7.5 K ± 1% to V_CC (Figure 10).
1
Port B (6) D–
Data
R x D Port B (6)
Port B (7) D+
Clock
T x D Port B (7)
Vcc
7.5 K Pullup
Pull-up Resistor Enable
In/Wake
VUS B
Vcc
Pad
Figure 10. Port B (6–7) Serial Communication Port
DS97KEY2005
PRELIMINARY
17