Z86C34 Datasheet, PDF (30/70 Pages) Zilog, Inc. – CMOS Z8 MCUs WITH ASCI UART OFFER EFFICIENT, COST-EFFECTIVE DESIGN FLEXIBILITY

Z86C34/C35/C36/C44/C45/C46
CMOS Z8® MCUs with ASCI UART
FUNCTIONAL DESCRIPTION (Continued)
nal program and data memory from addresses
16384/32768 to 65535.
Expanded Register File (ERF). The Z8 register file is ex-
panded to allow for additional system control registers, and
for mapping of additional peripheral devices along with I/O
ports into the register address area. The Z8 register address
space R0 through R15 is implemented as 16 groups of 16
registers per group (Figure 19). These register groups are
ZiLOG
known as the Expanded Register File (ERF). Bits 7–4 of reg-
ister RP select the working register group. Bits 3–0 of reg-
ister RP select the expanded register group. Three system
configuration registers reside in the Expanded Register File
at Bank F (PCON, SMR, WDTMR). The rest of the Expand-
ed Register is not physically implemented, and is open for
future expansion.
65535
65535
External
Data
Memory
External
Data
Memory
16384/32768
16383/32767
0
NotAddressable
0
ROM Mode
Figure 18. Data Memory Map
ROMless Mode
30
PRELIMINARY
DS007601-Z8X0499