em78p468n ELAN Microelectronics Corp, em78p468n Datasheet - Page 7

• Manufacturer Part Number: em78p468n
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

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Product Specification (V1.6) 12.31.2007
(This specification is subject to change without further notice)
• 4K×13 bits on-chip OTP-ROM
• 144 bytes general purpose register
• 128 bytes on-chip data RAM
• 272 bytes SRAM
• 8 level stacks for subroutine nesting
• Power-on voltage detector provided (2.0±0.1V) for
• Power-on voltage detector provided (1.7±0.1V) for
• Typically, 12 bi-directional tri-state I/O ports.
• 16 bi-directional tri-state I/O ports shared with LCD
• Up to 28 bi-directional tri-state I/O ports
EM78P468N
• Commercial: 2.3V ~ 5.5 V. (at 0 ° C~+70 ° C)
• Industrial: 2.5V ~ 5.5 V. (at -40 ° C ~+85 ° C)
EM78P468L
• Commercial: 2.1 V ~ 5.5 V. (at 0 ° C ~+70 ° C)
• Industrial: 2.3V ~ 5.5 V. (at -40 ° C ~+85 ° C)
• Normal mode: The CPU is operated on main
• Green mode: The CPU is operated on
• Idle mode: CPU idle, LCD display remains working
• Sleep mode: The whole chip stops working
• High frequency oscillator can select among
• Low frequency oscillator can select between
General Description
Features
CPU Configuration
I/O Port Configuration
Operating Voltage and Temperature Range:
Operating Mode:
Oscillation Mode
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).
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.
oscillator frequency (Fm)
sub-oscillator frequency (Fs) and main oscillator
(Fm) is stopped
EM78P468N
EM78P468L
segment output pin.
♦ Input port wake-up function (Port 6, Port 8).
♦
♦
Crystal, RC, or PLL (phase lock loop)
Crystal or RC mode
Works on Idle and Sleep mode.
Operation speed: DC ~ 10MHz clock input
Dual clock operation
Peripheral Configuration
• 8-bit real time clock/counter (TCC)
• One infrared transmitter / PWM generator function
• Four sets of 8 bits auto reload down-count timer
Eight Interrupt Sources: Three External and Five
Internal
• Internal interrupt source: TCC; Counters 1, 2;
• External interrupt source : INT0, INT1 and Pin
LCD Circuit
• Common driver pins: 4
• Segment driver pins: 32
• LCD Bias: 1/3, 1/2 bias
• LCD Duty: 1/4, 1/3, 1/2 duty
Package Type:
• Dice form: 59 pins
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• LQFP-64 pin: EM78P468NAQxS/xJ
• LQFP-44 pin: EM78P468NBQxS/xJ
• QFP-44 pin: EM78P468NCQxS/xJ
• QFP-64 pin: EM78P468NEQxS/xJ
Note: Green products do not contain hazardous
can be used as interrupt sources
♦ Counter 1: independent down-count timer
♦ Counter 2, High Pulse Width Timer (HPWT), and
♦ Programmable free running on chip watchdog
High/Low pulse width timer.
change wake-up (Port 6 and Port 8)
QFP-64 pin: EM78P468NQxS/xJ
substances
Low Pulse Width Timer (LPWT) shared with IR
function.
timer (WDT). This function can operate on
Normal, Green and Idle mode.
(Body 14mm × 20mm)
(Body 7mm × 7mm)
(Body 10mm × 10mm)
(Body 10mm × 10mm)
(Body 14mm × 14mm)
8-Bit Microcontroller
EM78P468N/L
The
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