LPC47S457-NC SMSC [SMSC Corporation], LPC47S457-NC Datasheet - Page 253

• Manufacturer Part Number: LPC47S457-NC
• Description: Advanced I/O with X-Bus Interface
• Manufacturer: SMSC [SMSC Corporation]

11.11 Keyboard/Mouse Timing
SMSC LPC47S45x
NAME
KDAT/
MDAT
KCLK/
MCLK
t1
t2
t3
t4
t5
t6
Time from DATA transition to falling edge of CLOCK
(Receive)
Time from rising edge of CLOCK to DATA transition
(Receive)
Duration of CLOCK inactive (Receive/Send)
Time to keyboard inhibit after clock 11 to ensure the
keyboard does not start another transmission (Receive)
Time from inactive to active CLOCK transition, used to
time when the auxiliary device samples DATA (Send)
Duration of CLOCK active (Receive/Send)
t1
Start Bit
CLK
t3
1
FIGURE 46 − KEYBOARD/MOUSE RECEIVE/SEND DATA TIMING
t2
t6
t4
Bit 0
CLK
2
DESCRIPTION
DATASHEET
Page 253 of 259
CLK
Bit 7
9
Parity Bit
CLK
10
MIN
30
30
>0
5
5
5
TYP
Stop Bit
t5
CLK
11
MAX
T4-5
25
50
50
50
25
UNITS
µsec
µsec
µsec
µsec
µsec
µsec
Rev. 06-01-06