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Revision 1.2
- 1 -
24 October 2000
MTU8B54E/55E/56E/57E
MYSON
TECHNOLOGY
FEATURES
GENERAL DESCRIPTION
BLOCK DIAGRAM
MTU8B5X series is an EPROM based 8-bit micro-
controller which employs a full CMOS technology
enhanced with low-cost, high speed and high noise
immunity. Watchdog Timer, RAM, EPROM, tri-state
I/O port, power down mode, and real time program-
mable clock/counter are integrated into this chip.
MTU8B5X contains 33 instructions, all are single
cycle except for program branches which take two
cycles.
On chip memory is available with 512x14 bits of
EPROM for MTU8B54E/55E, 1Kx14 bits of EPROM
for MTU8B56E, 2Kx14 bits of EPROM for
MTU8B57E and 24 to 72 bytes of static RAM.
EPROM-Based 8-Bit CMOS Microcontroller
• Total of 33 single word instructions .
• The fast execution time may be 200ns for all single
cycle instructions under 20MHz operating.
• Operating voltage range: 2.3V ~ 6.5V
• 8-bit data bus.
• 14-bit instruction word.
• Four-level stacks.
• On chip EPROM size : 512x14 bits for MTU8B54E/55E,
1Kx14 bits for MTU8B56E,
2Kx14 bits for MTU8B57E.
• Internal RAM size : 25 bytes for MTU8B54E/56E,
24 bytes for MTU8B55E,
•
72 bytes for MTU8B57E.
• Direct and indirect addressing modes for data accessing
• 8-bit real time clock/counter with 8-bit programmable
prescaler.
• Internal power-on Reset.
• Device Reset Timer.
• Code protection.
• Sleep mode for power saving.
• On chip Watchdog Timer(WDT) based on internal RC
oscillator.
• Three I/O ports PA, PB nad PC with independent direc-
tion control.
Four-level
Stack
RAM
Configuration
Word
OSCO
OSCI
MCLR
WDT/Timer0
Prescaler
Oscillator
Circuit
Osc Mode
Select
Sleep
WatchDog
Timer
T0CKI
Timer0
WDT
Time Out
T0MODE
Register
6
Vdd
Vss
Program
Counter
EPROM
Instruction
Register
Instruction
Decoder
FSR
PortA
PortB
Status
6
Accumulator
ALU
11
11
14
14
8
8
8
4
PA3:PA0
PB7:PB0
2
PortC
8
PC7:PC0
24, 25 or 27 Bytes
512 X 14 TO
2048 X 14
Only in MTU8B55E/57E
• 4 types of oscillator can be selected by code options:
- RC : Low-cost RC oscillator
- XTAL : Standard crystal oscillator
- HFXTAL : High frequency crystal oscillator
- LFXTAL : Low frequency crystal oscillator
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