Micrel, Inc.
MIC2555
Control Bit Locator
Location
Control Register 1
Control Bit
Control Register 2
Control Register 3
Interrupt Source
B6
GPIO Interrupt
bdis_acon, (sess_end)
bdis_acon_en
cp_off
cr_int
cr_int_sel
dat_se0
B4
B2
B1
B3
B7
dm_pull-down
dm_pull-up
dp_pull-down
dp_pull-up
ext_osc
GPIO_0
GPIO_1
GPIO_2
id_det_off
id_float
B3
B1
B2
B0
B5
B2
B0
B1
B2
B5
B3
id_gnd_in
id_gnd_out
oe_int_en
rcs_dis
B4
B5
B6
B7
scl_en
se_dm
se_dp
B4
B2
sess_end_en
sess_vld
pwr_dn
B4
B0
B1
speed
suspend
test bit
uart_en
B0
B1
B3
B6
B7
uart_io
vbus_chrg
vbus_dischrg
vbus_drv
vbus_vld
B7
B6
B5
B0
Serial Controller Register Bits
Example Table Format
Column Titles
Register
Addresses(1)
Field name
Size (bits)
Access
Description
Note:
Access type “rd/s/c” denotes a field that can be read, set to 1 or cleared to 0. The register can be read from either of
the Addresses indicated. When writing to the “set” Address, any 1s that are written cause the associated bit to be set.
When writing to the “clr” (Clear) Address, any 1s that are written cause the associated bit to be cleared.
Device ID Registers
MSB -> Higher byte of two byte word
LSB -> Lower byte of two byte word
USB-IF Vendor ID number. Address 00h contains
vendor_id
product_id
16
16
rd
rd
00h
02h
lower byte of Vendor ID. Address 01h contains upper
byte of Vendor ID.
A number unique to each manufacturer, for each
device type produced. The manufacturer assigns this
number. Address 02h contains lower byte. Address
03h contains upper byte.
M9999-060805
(408) 955-1690
June 2005
21
MICREL [ MICREL SEMICONDUCTOR ]
