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ADAM26P20 Schematic ( PDF Datasheet ) - ABOV

Teilenummer ADAM26P20
Beschreibung 4-BIT SINGLE-CHIP MICROCONTROLLERS
Hersteller ABOV
Logo ABOV Logo 




Gesamt 30 Seiten
ADAM26P20 Datasheet, Funktion
July 20, 2009 Ver 0.3
4-BIT SINGLE CHIP MICROCOMPUTERS
ADAM26PXX
USER`S MANUAL
ADAM26P16
ADAM26P20
ADAM26P20S
ADAM26P20T
ADAM26P23
ADAM26P24
ETACHIPS Co., Ltd.






ADAM26P20 Datasheet, Funktion
1. Overview
ADAM26PXX
16 15 14 13 12 11 10 9
1
2
34 567
8
9.90 ± 0.1
3.90 ± 0.1
1.27
0.43 ± 0.076
0-
0.65 ± 0.23
Outline (Unit : mm)
16 SOP(150MIL) Pin Dimension (dimensions in millimeters)
20 TSSOP(4.4mm) Pin Dimension (dimensions in millimeters)
Page 5 of 36

6 Page









ADAM26P20 pdf, datenblatt
2. Architecture
ADAM26PXX
2.2. Address Register
The following registers are used to address the ROM.
Block address register (BA) :
Holds ROM's Block number (0~1h) to be addressed.
Block buffer register (BB) :
Value of BB is loaded by an SEBB and REBB command when newly addressing a block.
Then it is shifted into the BA when rightly executing a branch instruction (BR)
and a subroutine call (CAL).
Page address register (PA) :
Holds ROM's page number (0~Fh) to be addressed.
Page buffer register (PB) :
Value of PB is loaded by an LPBI command when newly addressing a page.
Then it is shifted into the PA when rightly executing a branch instruction (BR)
and a subroutine call (CAL).
Program counter (PC) :
Available for addressing word on each page.
Stack register (SR) :
Stores returned-word address in the subroutine call mode.
2.2.1. Block address register and Block buffer register :
Address one of block #0 to #1 in the ROM by the 1-bit register.
Unlike the program counter, the block address register is not changed automatically.
To change the block address, take two steps such as
(1) writing in the block buffer what block to jump (execution of SEBB or REBB) and
(2) execution of BR or CAL, because instruction code is of eight bits so that block
can not be specified at the same time.
In case a return instruction (RTN) is executed within the subroutine that has been
called in the other page, the page address will be changed at the same time.
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