EM78P468N/EM78P468L
8-Bit Microcontroller
1 General Description
The EM78P468N/L is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS
technology. Integrated onto a single chip are on chip Watchdog Timer (WDT), Data RAM, ROM, programmable real time
clock counter, internal/external interrupt, power down mode, LCD driver, infrared transmitter function, and tri-state I/O.
The series has an on-chip 4K×13-bit Electrical One Time Programmable Read Only Memory (OTP-ROM). The
EM78P468L provides multi-protection bits to prevent intrusion of user’s OTP memory code. Seven Code option bits are
available to meet user’s requirements. Special 13 bits customer ID options are provided as well.
With its enhanced OTP-ROM feature, the EM78P468N/L 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.
2 Features
CPU Configuration
Peripheral Configuration
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4K×13 bits on-chip OTP-ROM
144 bytes general purpose register
128 bytes on-chip data RAM
272 bytes SRAM
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8-bit real time clock/counter (TCC)
One infrared transmitter / PWM generator function
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Four sets of 8 bits auto reload down-count timer can be
used as interrupt sources
8 level stacks for subroutine nesting
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Counter 1: independent down-count timer
Power-on voltage detector provided (2.0±0.1V) for
EM78P468N
Counter 2, High Pulse Width Timer (HPWT), and
Low Pulse Width Timer (LPWT) shared with IR
function.
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Power-on voltage detector provided (1.7±0.1V) for
EM78P468L
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Programmable free running on chip watchdog timer
(WDT). This function can operate on Normal, Green
and Idle mode.
I/O Port Configuration
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Typically, 12 bi-directional tri-state I/O ports.
16 bi-directional tri-state I/O ports shared with LCD
segment output pin.
Eight Interrupt Sources: Three External and Five Internal
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Up to 28 bi-directional tri-state I/O ports
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Internal interrupt source: TCC; Counters 1, 2;
High/Low pulse width timer.
Operating Voltage and Temperature Range:
EM78P468N
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External interrupt source : INT0, INT1 and Pin change
wake-up (Port 6 and Port 8)
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Commercial: 2.3V ~ 5.5 V. (at 0 C~+70 C)
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Industrial: 2.5V ~ 5.5 V. (at -40 C ~+85 C)
LCD Circuit
EM78P468L
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Common driver pins: 4
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Commercial: 2.1 V ~ 5.5 V. (at 0 C ~+70 C)
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Segment driver pins: 32
LCD Bias: 1/3, 1/2 bias
LCD Duty: 1/4, 1/3, 1/2 duty
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Industrial: 2.3V ~ 5.5 V. (at -40 C ~+85 C)
Operating Mode:
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Normal mode: The CPU is operated on main
oscillator frequency (Fm)
Package Type:
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Green mode: The CPU is operated on sub-oscillator
frequency (Fs) and main oscillator (Fm) is stopped
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Dice form: 59 pins
QFP-64 pin: EM78P468NQxS/xJ
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Idle mode: CPU idle, LCD display remains working
Sleep mode: The whole chip stops working
(Body 14mm × 20mm)
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LQFP-64 pin: EM78P468NAQxS/xJ
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Input port wake-up function (Port 6, Port 8).
Works on Idle and Sleep mode.
(Body 7mm × 7mm)
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Operation speed: DC ~ 10MHz clock input
Dual clock operation
LQFP-44 pin: EM78P468NBQxS/xJ
(Body 10mm × 10mm)
Oscillation Mode
QFP-44 pin: EM78P468NCQxS/xJ
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High frequency oscillator can select among Crystal,
RC, or PLL (phase lock loop)
(Body 10mm × 10mm)
Note: Green products do not contain hazardous
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Low frequency oscillator can select between Crystal
or RC mode
substances
Product Specification (V1.5) 02.15.2007
(This specification is subject to change without further notice)
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ELAN [ ELAN MICROELECTRONICS CORP ]
