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PDF ADAM22P20 Data sheet ( Hoja de datos )
| Número de pieza | ADAM22P20 | |
| Descripción | 4-BIT SINGLE CHIP MICROCOMPUTERS | |
| Fabricantes | Abov | |
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April 30, 2008 Ver 0.0
4-BIT SINGLE CHIP MICROCOMPUTERS
ADAM22XXX
USER`S MANUAL
• ADAM22C16
• ADAM22P16
• ADAM22C20
• ADAM22P20
• ADAM22C20S
• ADAM22P20S
• ADAM22C23
• ADAM22P23
• ADAM22C24
• ADAM22P24
1 page  
1. Overview
ADAM22XXX
20 19 1 8 17 16 15 14 13 12 11
1 2 3 4 5 6 7 8 9 10
0.510MAX
0.492MIN
0.323MAX
0.291MIN
0.221MAX
0.197MIN
0.022MAX
0.014MIN
0.050BSC
0-8˚ ↓
↑
→
Outline (Unit : Inch)
20 SOP(209MIL) Pin Dimension (dimensions in inch)
←
0.028MAX
0.012MIN
16 SOP (150MIL) Pin Dimension (dimensions in millimeters)
Page 4 of 35
5 Page 
2. Architecture
ADAM22XXX
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.
Page 10 of 35
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADAM22P20.PDF ] | |
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