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ZLR64400ROMMCU Datasheet(PDF) 39 Page - Zilog, Inc.

Part # ZLR64400ROMMCU
Description  ZLR64400 ROM MCU with Learning Amplification
PDF  155 Pages
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

ZLR64400ROMMCU Datasheet(HTML) 39 Page - Zilog, Inc.

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PS024502-1205
P R E L I M I N A R Y
Register File
ZLR64400 ROM MCU
Product Specification
29
Register File
This device features 1056 bytes of register file space, organized in 256-byte banks. Bank 0
contains 237 bytes of RAM addressed as general-purpose registers, 4 port addresses (of
which one is reserved), and 16 control register addresses. Banks 1, 2, and 3 each contain
256 general-purpose register bytes. Banks D and F each contain 16 addresses for control
registers. All other banks are reserved and must not be selected.
The current bank is selected for 8-bit direct or indirect addressing by writing Register
Pointer bits RP[3:0]. In the current bank, a 16-byte working register group (addressed as
R0–R15) is selected by writing RP[7:4]. A working register operand requires only 4 bits
of program memory. There are 16 working register groups per bank. See Figure 9 on
page 31 and Figure 10 on page 32.
Figure 8. Program/Constant Memory Map
Program
IRQ 0–5
or
000Ch (Reset)
ROM Memory
Vectors
0000h
= 16-bit Address
Not to Scale
Constants
FFFFh



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