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EM78P468N/EM78P468L
8-Bit Microcontroller
Product Specification (V1.5) 02.15.2007
• 1
(This specification is subject to change without further notice)
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
• 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
EM78P468N
• Power-on voltage detector provided (1.7±0.1V) for
EM78P468L
I/O Port Configuration
• Typically, 12 bi-directional tri-state I/O ports.
• 16 bi-directional tri-state I/O ports shared with LCD
segment output pin.
• Up to 28 bi-directional tri-state I/O ports
Operating Voltage and Temperature Range:
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)
Operating Mode:
• Normal mode: The CPU is operated on main
oscillator frequency (Fm)
• Green mode: The CPU is operated on sub-oscillator
frequency (Fs) and main oscillator (Fm) is stopped
• Idle mode: CPU idle, LCD display remains working
• Sleep mode: The whole chip stops working
♦ Input port wake-up function (Port 6, Port 8).
Works on Idle and Sleep mode.
♦ Operation speed: DC ~ 10MHz clock input
♦ Dual clock operation
Oscillation Mode
• High frequency oscillator can select among Crystal,
RC, or PLL (phase lock loop)
• Low frequency oscillator can select between Crystal
or RC mode
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 can be
used as interrupt sources
♦ Counter 1: independent down-count timer
♦ Counter 2, High Pulse Width Timer (HPWT), and
Low Pulse Width Timer (LPWT) shared with IR
function.
♦ Programmable free running on chip watchdog timer
(WDT). This function can operate on Normal, Green
and Idle mode.
Eight Interrupt Sources: Three External and Five Internal
• Internal interrupt source: TCC; Counters 1, 2;
High/Low pulse width timer.
• External interrupt source : INT0, INT1 and Pin change
wake-up (Port 6 and Port 8)
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
• QFP-64 pin: EM78P468NQxS/xJ
(Body 14mm × 20mm)
• LQFP-64 pin: EM78P468NAQxS/xJ
(Body 7mm × 7mm)
• LQFP-44 pin: EM78P468NBQxS/xJ
(Body 10mm × 10mm)
• QFP-44 pin: EM78P468NCQxS/xJ
(Body 10mm × 10mm)
Note: Green products do not contain hazardous
substances