MEC1322 Datasheet, PDF (409/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
TABLE 38-14: PS/2 CHANNEL TRANSMISSION TIMING PARAMETERS (CONTINUED)
Name
Description
MIN
TYP
MAX
t11 DATA output by MEC1322 following the
1.0
falling edge of CLK. The auxiliary periph-
eral device samples DATA following the ris-
ing edge of CLK.
t12 Rising edge following the 11th falling clock
3.5
7.1
edge to PS_T/R bit driven low.
t13 Trailing edge of PS_T/R to XMIT_IDLE bit
500
asserted.
t14 DATA released to high-Z following the
PS2_T/R bit going low.
t15 XMIT_IDLE bit driven high to interrupt gen-
erated.
Note1- Interrupt is cleared by writing a 1 to
the status bit in the GIRQ17 source regis-
ter.
t17 Trailing edge of CLK is held low prior to
going high-Z
FIGURE 38-16: PS/2 RECEIVE TIMING
Units
µs
µs
ns
PS2_CLK
PS2_DATA
PS2_EN
PS2_T/R
RDATA_RDY
Read Rx Reg
Interrupt
t7
t3
t2
t4
t5
t1
t6
D0 D1 D2 D3 D4 D5 D6 D7 P S
t10
t11
t8
t9
t12
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DS00001719D-page 409