Micrel, Inc.
MIC2555
Control Register 1
Set & Clear
speed
set – 04h
clr – 05h
1 Æset = 1
1 Æclr = 0
0 = USB Low Speed mode
1 = USB Full Speed mode
0 = Full power mode
1
1
rd/s/c
rd/s/c
bit 0
bit 1
suspend
1 = Low power mode
0 = VP-VM USB mode
1 = DAT-SE0 USB mode
Not used
dat_se0
test bit
1
1
rd/s/c
rd/s/c
bit 2
bit 3
0 = No action.
bdis_acon_en
1
rd/s/c
bit 4
1 = Attaches pull-up resistor to D+ after detecting
SE0 condition and sets interrupt flag.
0 = OE_INT/ is an input.
1 = OE_INT/ becomes an output and is asserted
LOW when interrupt occurs, if suspend = 1. If
suspend = 0, pin remains an input.
0 = USB mode
oe_int_en
uart_en
uart_io
1
1
1
rd/s/c
rd/s/c
rd/s/c
bit 5
bit 6
bit 7
1 = UART mode
0 = GPIO pins operate as standard GPIO.
1 = GPIO_0 = 2nd UART RX
GPIO_1 = 2nd UART TX
GPIO_2 = standard GPIO
M9999-060805
(408) 955-1690
June 2005
22
MICREL [ MICREL SEMICONDUCTOR ]
