Z8 cpu (see, Figure 23 – Zilog Z86193 User Manual
Page 43
Z8
®
CPU
User Manual
UM001604-0108
Reset
36
Figure 23. Example of External Power-On Reset Circuit
Table 13. ERF Bank 0 Reset Values at RESET
Register
(Hex)
Register Name
Bits
Comments
7
6
5
4
3
2
1
0
00
Port 0
U U U U U U U U Input mode, output set to push–pull.
01
Port 1
U U U U U U U U Input mode, output set to push–pull.
02
Port 2
U U U U U U U U Input mode, output set to open
drain.
03
Port 3
1
1
1
1
U U U U Standard digital input and output
Z86L7X Family Device Port P34-
P37 = 0
(Except Z86L70/71/75)
All other Z8 = 1.
04–EF
General-Purpose
Registers 04h–EFh
U U U U U U U U Undefined.
Table 14. Sample Expanded Register File Bank C Reset Values
Register
(Hex)
Register Name
Bits
Comments
7
6
5
4
3
2
1
0
00
SPI Compare (SCOMP)
0
0
0
0
0
0
0
0
01
Receive Buffer (RxBUF)
U
U
U
U
U
U
U
U
02
SPI Control (SCON)
U
U
U
U
0
0
0
0
1
µF
+5V
100 K
Ω
RESET
1 K
to
200 K
Ω
10 V
- Z86233 Z86243 Z86733 Z86743 Z86C02 Z86C04 Z86C08 Z86C15 Z86C21 Z86C30 Z86C31 Z86C33 Z86C36 Z86C40 Z86C43 Z86C61 Z86C62 Z86C63 Z86C65 Z86C83 Z86C90 Z86C91 Z86C93 Z86C96 Z86E02 Z86E03 Z86E04 Z86E06 Z86E07 Z86E08 Z86E15 Z86E21 Z86E30 Z86E31 Z86E33 Z86E34 Z86E40 Z86E43 Z86E44 Z86E61 Z86E63 Z86E83 Z86K15 Z86L02 Z86L04 Z86L08 Z86L16 Z8E000 Z8E001 Z8PE003