Z86L88 Datasheet, PDF (40/80 Pages) Zilog, Inc. – INFRARED REMOTE CONTROLLERS

Z86L88
Low-Voltage IR Microcontroller
33
r₇ ^r₆ r₅ r₄
r₃ r₂ r₁ r_{0 R253}
The upper nibble of the register file address
provided by the register pointer specifies
the active working-register group
7F
70
6F
60
5F
50
4F
40
3F
Specified Working
30
Register Group
2F
20
1F
Register Group 1
10
0F
Register Group 2
00
I/O Ports
The lower nibble
of the register
file address
provided by the
Instruction points
to the specified
register
R15 to R0
R15 to R4*
R3 to R0*
Figure 30. Register Pointer
Stack
The Z86L88 internal register file is used for the stack. An 8-bit Stack Pointer
(R255) is used for the internal stack that resides in the general-purpose registers
(R4–R239). SPH is used as a general-purpose register only when using internal
stacks.
19-4614; Rev 0; 4/09