FEDL64P168-01
Semiconductor
ML64P168
4-Bit Microcontroller with Built-in RC Oscillation Type A/D Converter and LCD Driver
1/51
This version: Sep. 27,1999
Previous version: Jun.
22,1999
GENERAL DESCRIPTION
The ML64P168 is a one-time-programmable ROM-version product, which has one-time PROM (OTP)
as internal program memory. On the other hand, the ML64168 is a mask ROM-version product, which
has mask ROM as internal program memory.
Unlike the mask ROM-version product (ML64168), the ML64P168 cannot be supplied in the form of a
chip.
The ML64P168 has two operation modes, microcontroller operation mode and PROM mode. The
microcontroller operation mode is used to operate the ML64P168 like a ML64168 and the PROM
mode is used to program or read the PROM.
The ML64P168 is a low power 4-bit microcontroller incorporating the Oki's original CPU core nX-
4/30.
The ML64P168 provides a minimum instruction execution time of 4.3
s (@700kHz).
The ML64P168 contains 8160-byte program memory, 512-nibble data memory, three 4-bit input-output
ports, 4-bit input port, 4-bit output port, 2-channel RC oscillation type A/D converter, LCD driver for
up to 120 segments, and buzzer output port.
APPLICATION
The ML64P168 is best suited for low power, high precision thermometers and hygrometers.
FEATURES
Processing speed
Minimum instruction execution time
: 4.3
s @700 kHz
91.6
s @32.768 kHz
Clock generation circuit
Low-speed clock
: 32.768 kHz crystal oscillator
High-speed clock
: 700 kHz RC oscillator ( with an external resistor )
CPU clock is selectable as Low-speed clock / High-speed clock by software.
Operating voltage
: 1.5 V spec. / 3.0 V spec. ( selectable by mask option )
1.45 to 1.70 V (1.5V spec.)
2.7 to 3.5 V (3.0V spec.)
Operating temperature
: 0 to +65
C
The information contained herein can change without notice owing to product and/or technical improvements.
Before using the product, please make sure that the information being referred to is up-to-date.
FEDL64P168-01
Semiconductor
ML64P168
2/51
Memory space
Internal program memory
: 8160 bytes
Internal data memory
: 512 nibbles
RC oscillation type A/D converter
: 2 channels
Time division 2-channel method
Counter A
: 1 / ( 10
4
8 )
1
Counter B
: 1 / 2
14
1
I/O port
Input-output port
: 3 ports
4 bits
Input port
: 1 port
4 bits
Output port
: 1 port
4 bits
( 8 out of the 34 LCD driver outputs can be used as
output-only ports by mask option. )
LCD driver
: 34 outputs
(1) At 1/4 duty and 1/3 bias
: 120 segments (max.)
(2) At 1/3 duty and 1/3 bias
: 93 segments (max.)
(3) At 1/2 duty and 1/2 bias
: 64 segments (max.)
Voltage Regulator for LCD Driver (selectable by mask option)
The LCD panel display is stable regardless of temporary supply voltage drop, because the
voltage generated by the voltage regulator for LCD driver is supplied to the bias voltage
generator as a reference voltage.
LCD Operating Voltage
When the voltage regulator for LCD driver is used
: 3.6 V ( Duty cycle = 1/4 or 1/3 )
: 2.4 V ( Duty cycle = 1/2 )
When the voltage regulator for LCD driver is not used
: 4.5 V ( Duty cycle = 1/4 or 1/3 )
: 3.0 V ( Duty cycle = 1/2 )
Buzzer driver
: 1 output ( 4 output modes selectable )
Serial port
: Synchronous 8-bit transfer
Selectable as external clock / internal clock
Selectable as MSB first / LSB first
Capture circuit
: 2 channels ( 32Hz, 64Hz, 128Hz, 256Hz )
Battery check circuit
: 1 ( incorporated into the input-only port )
Watchdog timer
Interrupt
External interrupt
: 2 sources
Internal interrupt
: 8 sources
Package:
80-pin plastic QFP ( QFP80-P-1420-0.80-BK )
Product name : ML64P168 - xxxGP ( written PROM )
ML64P168 - NGP
( blanked PROM )
80-pin plastic QFP ( QFP80-P-1414-0.65-K )
Product name : ML64P168 - xxxGA ( written PROM )
ML64P168 - NGA ( blanked PROM )
xxx indicates a code number.
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