ZLP12840 datasheet(40/58 Pages) ZILOG

40 / 58 page

PS024406-0106

P R E L I M I N A R Y

ZLP12840 OTP MCU

Product Specification

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

R0R15) 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 (128KB Device)

Program

IRQ 05

000Ch (Reset)

Page 0

Vectors

Constants

Only

Page 1

0000h

= 16-bit Address (In Page)

{0, 0000h} = {PMPR[0], 16-bit address} (LDC, LDCI Only)

Not to Scale

Constants

{1, 0000h}

{1, FFFFh}

{0, 0000h}

{0, FFFFh} FFFFh

0000h

FFFFh

ZLP12840 Datasheet(PDF) 40 Page - Zilog, Inc.