Revision 1.6
-14-
02/28/2000
R/O
R/O
R/O
R/O
R/O
R/O
R/O
R/O
SENSE8
SENSE7
SENSE6
SENSE5
SENSE4
SENSE3
SENSE2
SENSE1
Key matrix sense input port
All SENSE1~SENSE8 bits indicate state of the corresponding SENSE1~SENSE8 pins.
Value on POR: “X X X X X X X X”
FFRST (Address 1Ah, FIFO reset register)
W/O
W/O
FFRST123
FFRST0
FFRST123: Reset endpoint 1/2/3 FIFO read/write pointer
Write “1” to this bit will reset endpoint 1/2/3 FIFO read/write pointer. Data in endpoint 1/2/3 FIFO remain
unchanged. Before data are written into endpoint 1/2/3 FIFO, EPSEL should be set correctly then FFRST123
should be set.
FFRST0: Reset endpoint 0 FIFO read/write pointer
Write “1” to this bit will reset endpoint 0 FIFO read/write pointer. Data in endpoint 0 FIFO remain
unchanged. Before data are read/written into endpoint 0 FIFO, FFRST0 should be set first.
MODESEL (Address 1Bh, Mode select register)
R/W
R/W
OSCSTP
PWRON
OSCSTP: Suspend clock stop control bit
1: Clock is stopped while suspend
0: Clock is not stopped while suspend
PWRON: Power reset indicator
1: Power on reset detected
0: USB bus reset detected
Value on POR: “- - - - - - 0 1”
USBIOCTL (Address 1Ch, I/O control register for USB D+/D-)
R/W
R/W
R/W
R/W
DMOE
DPOE
DM
DP
DMOE: D- pin output enable control bit
1: D- pin digital output enable
0: D- pin digital output disable
DPOE: D+ pin output enable control bit
1: D+ pin digital output enable
0: D+ pin digital output disable
DM: Digital output value of D- pin. This pin is open drain output. Output high will be tri-stated.
DP: Digital output value of D+ pin. This pin is open drain output. Output high will be tri-stated.
Value on POR: “- - - - 1 1 0 0”
EPSEL (Address 1Dh, Endpoint select register)
R/W
R/W
R/W
EPSEL3
EPSEL2
EPSEL1
EPSEL[3: 1]: Endpoint select control bits
Bit Value
Endpoint to be selected
001
Endpoint 1
010
Endpoint 2
100
Endpoint 3
Value on POR: “- - - - - X X X”
SERCTL (Address 1Eh, PS/2 or RS232 mouse port control register)
R/WC
R/W
RXFLG
SRXEN
RXFLG: Data received flag on PS/2 interface
1: Data received and saved in SERBUF
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