Micrel, Inc.
MIC2555
DAT_VP_RX, SE0_VM_TX, RCV
OE_INT/
DAT_VP_RX, SE0_VM_TX and RCV provide the data
transfer interface between the system controller and
MIC2555. RCV is an output only pin, supplying the
output of a differential receiver monitoring the D+, D-
pins, while DAT_VP_RX, SE0_VM_TX are bi-directional
(I/O) pins and change function in accordance with
different USB and UART mode selections.
The “output enable – interrupt bar” (OE_INT/) pin has
three modes of operation, shown in the table below.
Suspend modes are controlled by the oe_int_en bit
found in Control Register 1.
In UART mode, DAT_VP_RX and SE0_VM_TX are the
primary data transmit and receive pins.
In USB mode, the setting of the dat_se0 determines their
action, as described in the tables below.
OE_INT/ Operating Modes
suspend
oe_int_en
I/O
Description
OE_INT/ acts as output enable, and controls direction of DAT_VP_RX,
SE0_VM_TX, D+ and D-
0
x
Input
1
1
0
1
Input
OE_INT/ is an input, but does not control anything
OE_INT/ is asserted low if interrupt condition exists
Output
M9999-060805
(408) 955-1690
June 2005
18
MICREL [ MICREL SEMICONDUCTOR ]
