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EM78862K Schematic ( PDF Datasheet ) - ELAN Microelectronics

Teilenummer EM78862K
Beschreibung 8-Bit RISC Type Microprocessor
Hersteller ELAN Microelectronics
Logo ELAN Microelectronics Logo 




Gesamt 30 Seiten
EM78862K Datasheet, Funktion
EM78862K
8-Bit RISC Type
Microprocessor
Product
Specification
DOC VERSION 1.1
ELAN MICROELECTRONICS CORP.
July 2012






EM78862K Datasheet, Funktion
Contents
vi Product Specification (V1.1) 07.16.2012

6 Page









EM78862K pdf, datenblatt
EM78862K
8-Bit RISC Type Microcontroller
6 Function Descriptions
6.1 Operational Registers
6.1.1 R0 (Indirect Address Register)
R0 is not a physically implemented register. It is used as indirect addressing pointer.
Any instruction using R0 as register actually accesses the data pointed by the RAM
Select Register (R4).
6.1.2 R1 (TCC)
„ Increased by an external signal (16.384KHz or RC/2), or by the instruction cycle
clock.
„ Written and read by the program as any other register.
6.1.3 R2 (Program Counter)
The structure is depicted in Figure 6-1a below.
„ Generates 16K × 13 on-chip ROM addresses to the relative programming
instruction codes.
„ "JMP" instruction allows the direct loading of the low 10 program counter bits.
„ "CALL" instruction loads the low 10 bits of the PC and PC+1, and then pushes it into
the STACK (14 bits).
„ "RET'' ("RETL k,” "RETI") instruction loads the contents of the top most Stack into
program counter.
„ "MOV R2, A" allows the loading of an address from the A register to the PC, and the
9th and 10th bits are cleared to "0.''
„ "ADD R2, A" allows a relative address be added to the current PC, and contents of
the 9th and 10th bits are cleared to "0.''
„ "TBL" allows a relative address to be added into the current PC, and its 9th and 10th
bits content do not change. The most significant bit (A10~A13) will be loaded into
the status register (R5) with the contents of bits PS0~PS3 upon execution of a
"JMP,'' "CALL," “MOV R2, A,'' "ADD R2, A,'' or ”TBL” instruction.
Figure 6-1a Program Counter Organization
6 Product Specification (V1.1) 76.16.2012
(This specification is subject to change without further notice)

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