Z8673312PSG Datasheet, PDF (52/84 Pages) Zilog, Inc. – CMOS Z8 OTP Microcontrollers

65535
EPROM
External
Data
Memory
CMOS Z8^® OTP Microcontrollers
Product Specification
48
ROMless Mode
External
Data
Memory
4096/8192/16384
4095/8191/16383
Not Addressable
0
(Z86E43/743/E44 Only)
Figure 23. Data Memory Map
Register File. The register file consists of three I/O port registers, 236/125 general-pur-
pose registers, 15 control and status registers, and three system configuration registers in
the expanded register group. The instructions can access registers directly or indirectly
through an 8-bit address field. This allows a short 4-bit register address using the Register
Pointer (see Figure 24). In the 4-bit mode, the register file is divided into 16 working reg-
ister groups, each occupying 16 continuous locations. The Register Pointer addresses the
starting location of the active working-register group.
Note: Register Group E0-EF can only be accessed through working register
and indirect addressing modes.
PS022901-0508
Electrical Characteristics