EM78P468N/L
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).
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.
The
EM78P468L provides multi-protection bits to prevent intrusion of user’s OTP memory code. Seven Code option bits are
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
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
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.
♦
I/O Port Configuration
•
•
•
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)
Common driver pins: 4
Segment driver pins: 32
LCD Bias: 1/3, 1/2 bias
LCD Duty: 1/4, 1/3, 1/2 duty
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)
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
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
LCD Circuit
•
•
•
•
EM78P468L
Operating Mode:
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)
QFP-64 pin: EM78P468NEQxS/xJ
(Body 14mm
×
14mm)
•
•
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
Note:
Green products do not contain hazardous
substances
Product Specification (V1.6) 12.31.2007
(This specification is subject to change without further notice)
•
1
EMC [ ELAN MICROELECTRONICS CORP ]
