Z86319 Datasheet, PDF (13/23 Pages) Zilog, Inc. – PS/2 MOUSE CONTROLLER

Zilog
Z86319
PS/2 Mouse Controller
FUNCTIONAL DESCRIPTION
The Z86319 MCU incorporates the following special fea- Reset. Upon power-up, the Power-On Reset circuit waits
1 ^{tures to enhance the Z8 architectural core for use in mice, for TPOR, plus 18 clock cycles, then starts program exe-}
trackballs, and other consumer applications.
cution at address 000CH (Figure 13). The Z86319 control
registers' reset values are shown in Table 4.
POR
(Cold Start)
Delay
TPOR
RC OSC
18 CLK
Reset Filter
Chip
Reset
Figure 13. Internal Reset Configuration
Table 4. Z86319 Control Registers
Reset Values
Addr. Reg.
D7
D6
D5
D4
D3
D2
F1
TMR
0
0
0
0
0
0
F2
T1
U
U
U
U
U
U
F3
PRE1
U
U
U
U
U
U
F4
T0
U
U
U
U
U
U
F5
PRE0
U
U
U
U
U
U
F6
P2M
1
1
1
1
1
1
F7
P3M
U
U
U
U
U
U
F8
P01M
U
U
U
0
U
U
F9
IPR
U
U
U
U
U
U
FA
IRQ
U
U
0
0
0
0
FB
IMR
0
U
U
U
U
U
FC
FLAGS
U
U
U
U
U
U
FD
RP
U
U
U
U
U
U
FF
SPL
U
U
U
U
U
U
D1
D0
Comments
0
0
U
U
0
0
U
U
U
0
1
1 Inputs after reset
1
0
0
1
U
U
0
0
U
U
U
U
U
U
U
U
DS97KEY1605
PRELIMINARY
13