® MOTOROI.A
MC680ST2
Advance Information
8-BIT MICROCOMPUTER UNIT WITH PLL LOGIC
The MC6805T2 Microcomputer Unit (MCU) with PLL logic is a
member of the M6805 HMOS Family of low-cost single-chip microcom-
puters. This 8-bit microcomputer contains a CPU, on-chip clock, ROM,
RAM, 1/0, timer, and the PLL logic for an RF synthesizer. It is designed
for the user who needs an economical microcomputer with the proven
capabilities of the M6800-based instruction set, as well as the necessary
logiC required for frequency synthesis applications. The following are
some of the hardware and software highlights of the MC6805T2 MCU.
HARDWARE FEATURES
• 8-Bit Architecture
• 64 Bytes of RAM
• Memory Mapped 1/0
• 2508 Bytes of User ROM
• Timer Start/Stop and Source Select
• 19 TTL/CMOS Compatible Bidirectional 1/0 Lines (Eight Lines are
LED Compatible)
• On-Chip Ciock Generator
• Zero-Crossing Detection
• Self-Check Mode
• Master Reset
• Complete Development System Support on EXORciser
• 5 V Single Supply
• 14-Bit Binary Variable Divider
• 10-Stage Mask-Programmable Reference Divider
• Three-State Phase and Frequency Comparator
• Suitable for TV Frequency Synthesizers
SOFTWARE FEATURES
Similar to M6800
Byte Efficient Instruction Set
Easy to Program
True Bit Manipulation
Bit Test and Branch Instructions
Versatile Interrupt Handling
Versatile Index Register
Powerful Indexed Addressing for Tables
Full Set of Conditional Branches
Memory Usable as Registersl Flags
Single Instruction Memory Examinel Change
10 Powerful Addressing Modes
All Addressing Modes Apply to ROM, RAM, and 1/0
USER SELECTABLE OPTIONS
• Internal8-Bit Timer with Selectable Clock Source (External Timer
Input or Internal Machine Clock)
• Timer Prescaler Option (Seven Bits 2n)
• Eight Bidirectional 1/0 Lines with TTL or TTL/CMOS Interface
Option or Open-Drain Drive
• Four Vectored Interrupts; Timer, Software, and two External
• Low Voltage Inhibit Option
This document contains information on a new product. Specifications and information herein
are subject to change without notice
3-481
HMOS
(HIGH DENSITY, N-CHANNEL,
SILICON-GATE, DEPLETION LOAD)
8-BIT
MICROCOMPUTER
WITH PLL LOGIC
L SUFFIX
CERAMIC PACKAGE
CASE 719
•
PLASTIC PACKAGE
CASE 710
PIN ASSIGNMENT
VSS
INT
VCC
EXTAL
XTAL
NUM
<l>COMP
PCOITIMER
PCl
PC2
fin
PBO
PBl
PB2
RESET
PA7
PA6
PA5
PA4
PA3
PA2
PAl
PAO
PB7
PB6
PB5
PB4
PB3
