Z86D990 Datasheet, PDF (20/102 Pages) Zilog, Inc. – Low-Voltage Micro controllers with ADC

Z86D990/Z86D991 OTP and Z86L99X ROM
Low-Voltage Microcontrollers with ADC
13
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 6. 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
Z86D99/Z86L99. Figure 7 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 Z86D99/Z86L99 fam-
ily has implemented 21 of the 32 available registers.
PS003807-1002
PRELIMINARY