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Mio336i PDA Maintenance
Mio336i PDA Maintenance
1.3.2.11 Micro-Controller : EM78P156ELAS
EM78P156EL is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS
technology. It is equipped with 1K*13-bits Electrical One Time Programmable Read Only Memory (OTP-ROM).
It provides a protection bit to prevent user’s code in the OTP memory from being intruded. 6 option bits are also
available to meet user’s requirements. With its OTP-ROM feature, the EM78P156EL is able to offer a convenient
way of developing and verifying user’s programs. Moreover, user can take advantage of EMC writer to easily
program his development code.
In Mio336i PDA, EM78P156 is used to sense main battery capacity and inform CPU. If main battery capacity is
under which we set, micro-controller will take related action to force system into sleep mode. And if main battery
is still under the protection level, micro-controller will keep system in sleep mode even user press power button to
wake-up system.
Description :
Operating voltage range: 2.3V~5.5V
Operating temperature range: 0
°
C~70
°
C
Operating frequency rang (base on 2 clocks ):
- Crystal mode: DC~20MHz at 5V, DC~8MHz at 3V, DC~4MHz at 2.3V.
- ERC mode: DC~4MHz at 5V, DC~4MHz at 3V, DC~4MHz at 2.3V.
Feature :
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