Sharp PC-1500 - Page 12

All and more about Sharp PC-1500 at http: /l www.PC-1500.info
2-1. Outline of LH5801
6
The LH 5 801 Microprocessor is a CMOS static 8- bit microprocessor that fea tur es low
pow er di ssipati on performance inherent to CMOS LSI and lar ge ca pa ci ty dat<J
processi ng. No t o nl y that. it enabl es to lO configure a v arie1 y of xys tc rn s wit h a few
additio nal ch ip s b eca us e such as the LCD backplate sig na l generator. input port. external
latch
cloc k. and ti mer are bui lt in the 1.H580 1.
Features of the LH5801
CD 8-bit parallel da ta proc essi ng
CD Direct accessing of I 28K byt es
CD Use of a 6-bytc general purpose regis ter. in addi ti on t0 the accumulator. allows to
comp
ri se thr ee pairs of 2-byte date pointers.
© 9-bit timer ca pabi li ty
© Th ree kinds of i nt errupts
• N on-maskable i nt errupt
• Mas k. ab le interrupt
• Ti mer interrupt
© 82 instruction set
CD WAIT fu nction (memory access control poss ib le)
© Clock Pcb for input por1 (8- bi 1) and external lat ch
CV Memory backup functi on (BF !. BF O)
® LCD backplate signal control
@ Exu ernal crystal connection for clock generation
@ Re du cing program steps by means of 28 -k ind sin gle step ve ctor subroutine jump
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