CTM8B54E Datasheet, PDF (1/23 Pages) Ceramate Technical – EPROM-Based 8-Bit COMS Microcontroller

CTM8B54E/55E/56E/57E
EPROM-Based 8-Bit CMOS Microcontroller
FEATURES
• 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 CTM8B54E/55E,
1Kx14 bits for CTM8B56E,
2Kx14 bits for CTM8B57E.
• Internal RAM size : 25 bytes for CTM8B54E/56E,
24 bytes for CTM8B55E,
•
72 bytes for CTM8B57E.
• 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.
• 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
GENERAL DESCRIPTION
CTM8B5X 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.
CTM8B5X 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 CTM8B54E/55E, 1Kx14 bits of EPROM
for CTM8B56E, 2Kx14 bits of EPROM for
CTM8B57E and 24 to 72 bytes of static RAM.
BLOCK DIAGRAM
V_dd
Configuration
V_ss
Word
2OsSceMleoctde
OSCI
OSCO
MCLR
Sleep
Oscillator
Circuit
Four-level
11
Stack
WatchDog
Timer
T0CKI
WDT/Timer0
Prescaler
6
WDT
Time Out
Timer0
T0MODE
Register
6
8
RAM
24, 25 or 27 Bytes
Accumulator
FSR
Program
Counter
11
EPROM
512 X 14 TO
2048 X 14
14
Instruction
Register
14
Instruction
Decoder
PortA
PortB
4
PA3:PA0
8
PB7:PB0
Status
ALU
PortC
8
PC7:PC0
Only in CTM8B55E/57E
8
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN, R.O.C
Email: [e-mail]
Tel:[phone]
Fax:[phone]
Page 1 of 23
Http: www.ceramate.com.tw
Rev 1.1 Dec 26,2001