CR01
been initialized to 01H. The default value of this register
after power up is 9CH.
This register can only be accessed in the Configuration
Mode
and
after
the
CSR
has
Table 48 - CR01
DESCRIPTION
BIT NO.
BIT NAME
0,1
2
Reserved
Read Only. A read returns a 0.
Parallel Port
Power (see note
_PWRDN)
A high level on this bit, supplies power to the Parallel Port (Default).
A low level on this bit puts the Parallel Port in low power mode.
3
Parallel Port
Mode
Parallel Port Mode. A high level on this bit, sets the Parallel Port for
Printer Mode (Default). A low level on this bit enables the Extended
Parallel port modes. Refer to Bits 0 and 1 of CR4
4
5,6
7
Reserved
Reserved
Lock CRx
Read Only. A read returns a 1.
Read Only. A read returns a 0.
A high level on this bit enables the reading and writing of CR00-
CR18 (Default). A low level on this bit disables the reading and
writing of CR0-CRF. Once set to 0, this bit can only be set to 1 by a
hard reset or power-up reset.
CR02
This
initialized to 02H. The default value of this register after
power up is 88H.
register
can
only be accessed in the
Configuration Mode and after the CSR has been
Table 49 - CR02
DESCRIPTION
Read Only. A read returns a 0.
BIT NO.
BIT NAME
Reserved
0:2
3
UART1 Power
down (see note
_PWRDN)
A high level on this bit, allows normal operation of the Primary Serial
Port (Default). A low level on this bit places the Primary Serial Port
into Power Down Mode.
4:6
7
Reserved
Read Only. A read returns a 0.
UART2 Power
down
A high level on this bit, allows normal operation of the Secondary
Serial Port (Default). A low level on this bit places the Secondary
Serial Port into Power Down Mode.
Note_PWRDN: Power Down bits disable the respective logical device and associated pins, however the power down
bit does not disable the selected address range registers for the logical device. To disable the host
address registers the logical device's base address must be set below 100h. Therefore devices which
are powered down, but still reside at a valid I/O base address will participate in Plug-and-Play range
checking.
121
SMSC [ SMSC CORPORATION ]
