| | general description
the em78p418n is an 8-bit microprocessor designed and developed with low-power, high-speed cmos technology. this device has an on-chip 4kx13-bit electrical one time programmable read only memory (otp-rom). it provides protection bits to prevent intrusion of user””s code in the otp memory as well as from unwanted external accesses. three code option bits are also available to meet user””s application requirements.
with its enhanced otp-rom features, the em78p418n provides a convenient way of developing and verifying user””s programs. moreover, this otp device offers the advantages of easy and effective program updates, using development and programming tools. user can avail of the elan writer to easily program his development code.
- 4kx13 bits on-chip rom
- 144x8 bits on-chip registers (sram)
- 8 level stacks for subroutine nesting
- less than 2.2 ma at 5v/4mhz
- typically 15 ua, at 3v/32khz
- typically 1 ua, during sleep mode
- 3 bi-directional i/o ports
- wake-up port : p6
- 8 programmable pull-down i/o pins
- 8 programmable pull-high i/o pins
- 8 programmable open-drain i/o pins
- external interrupt : p50
- 2.3v~5.5v at 0°c~70°c (commercial)
- 2.5v~5.5v at -40°c~85°c (industrial)
- operating frequency range (base on 2 clocks):
- crystal mode: dc ~ 20 mhz, 5v; dc ~ 8mhz, 3v
- erc mode: dc ~ 16mhz, 5v; dc ~ 4mhz, 3v
- irc mode: 4mhz at 2.3v~5.5v
| internal rc frequency | draft rate | | temperature(-40°c~85°c) | voltage(2.3v~5.5v) | process | total | | 4mhz | ±10% | ±5% | ±4% | ±19% | | 8mhz | ±10% | ±6% | ±4% | ±20% | | 1mhz | ±10% | ±5% | ±4% | ±19% | | 455khz | ±10% | ±5% | ±4% | ±19% |
- all these four main frequencies can be trimmed by programming with four calibrated bits in the ice418n simulator. otp is auto trimmed by elan writer.
- fast set-up time requires only 2ms in high crystal and 32 clks in irc mode from wake up to operating mode.
- peripheral configuration
- 8-bit real time clock/counter (tcc) with selective signal sources, trigger edges, and overflow interrupt
- 8-bit multi-channel analog-to-digital converter with 12-bit resolution in vref mode
- three pulse width modulation (pwm ) with 10-bit resolution
- one pair of comparator (can be set as an op)
- power-down (sleep) mode
- tcc overflow interrupt
- input-port status changed interrupt (wake up from sleep mode)
- external interrupt
- adc completion interrupt
- pwm period match completion
- comparator high/low interrupt
- programmable free running watchdog timer
- power-on voltage detector provided (2.0v+0.1v)
- package types:
- 18 pin dip 300mil : em78p418nd18j/s
- 18 pin sop 300mil : em78p418nso18j/s
- 20 pin dip 300mil : em78p418nd20j/s
- 20 pin sop 300mil : em78p418nso20j/s
- 24 pin skinny dip 300mil : em78p418nk24j/s
- 24 pin sop 300mil : em78p418nso24j/s
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