Z86L972 Datasheet, PDF (19/91 Pages) Zilog, Inc. – Low-Voltage Microcontrollers

Z86L972/Z86L973/Z86L974
Low-Voltage Microcontrollers
12
Working Register Group 1 through Group E of the standard register file are avail-
able to be used as general-purpose RAM registers. You can use 233 bytes of gen-
eral-purpose RAM registers in the standard Z8 register file (Bank 0).
Grp/Bnk
(F0h)
(E0h)
(D0h)
(C0h)
(B0h)
(A0h)
(90h)
(80h)
(70h)
(60h)
(50h)
(40h)
(30h)
(20h)
(10h)
(00h)
Reg
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r0 to 15
r8 to 15
r0 to 7
Working Register Group Function
Control and Status Registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
General-purpose RAM registers
I/O Port Registers
Figure 5. Standard Z8 Register File (Working Reg. Groups 0–F, Bank 0)
Z8 Expanded Register File
In addition to the Standard Z8 Register File (Bank 0), Expanded Register File
Banks F and D of Working Register Group 0 have been implemented on the
Z86L972/Z86L973/Z86L974. Figure 6 illustrates the Z8 Expanded Register File
architecture. These two expanded register file banks of Working Register Group 0
provide a total of 32 additional RAM control and status registers. The Z86L972/
Z86L973/Z86L974 family has implemented 21 of the 32 available registers.
PS010504-1002
PRELIMINARY