HC705BD7 Datasheet | Next Electromics

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HC705BD7 Microcontroller Technical Summary

Overview

The HC705BD7 is an 8-bit HCMOS microcontroller from the M68HC05 family, designed for cost-sensitive embedded applications, particularly in multi-sync computer monitor control systems. This MCU integrates a comprehensive set of peripherals and memory options to provide a complete single-chip solution.

Key attributes include:

HC05 CPU core with enhanced instruction set
Multiple memory configurations (ROM/EPROM/RAM)
Versatile I/O capabilities with 26 bidirectional lines
Advanced timing and synchronization features
Multiple communication interfaces
Low-power operating modes

Features

Hardware Features

Core: HC05 8-bit CPU with enhanced instruction set
Memory:
- 384 bytes RAM (HC05BD7/HC705BD7)
- 11.75KB user ROM (HC05BD7)
- 11.5KB user EPROM (HC705BD7)
I/O: 26 bidirectional I/O lines (14 dedicated + 12 multiplexed)
Timing:
- 16 x 8-bit PWM channels (2 with +12V open-drain outputs)
- Multi-Function Timer (MFT)
- Sync Processor for display timing
Analog: 6-bit ADC with 4 input channels
Communication: DDC12AB interface module
Packages: 40-pin DIP and 42-pin SDIP options

Software Features

Standard HC05 instruction set with additional bit manipulation instructions
Multiple interrupt vectors with priority handling
Flexible power management modes (STOP, WAIT)
Watchdog timer (COP) for system reliability
Bootstrap loader for programming

Applications

The HC705BD7 is particularly suited for:

Multi-sync computer monitor controllers
Display timing and synchronization systems
Industrial control systems
Consumer electronics
Embedded systems requiring PWM control
Analog sensor interfaces

Electrical Characteristics

Absolute Maximum Ratings

Supply Voltage (VDD): -0.3V to +7.0V
Input Voltage (any pin): -0.3V to VDD+0.3V
Operating Temperature: -40°C to +85°C
Storage Temperature: -55°C to +150°C

DC Characteristics (VDD = 5V ±10%, TA = -40°C to +85°C)

Input High Voltage: 0.7VDD min
Input Low Voltage: 0.2VDD max
Output High Voltage: VDD-0.8V min (Ioh = -0.8mA)
Output Low Voltage: 0.4V max (Iol = 1.6mA)
Power Supply Current:
- Run Mode: 10mA typical @ 4MHz
- Wait Mode: 3mA typical @ 4MHz
- Stop Mode: 50μA max

Timing Characteristics

Oscillator Frequency: 1MHz to 4MHz
Instruction Cycle Time: 1μs @ 4MHz
Reset Pulse Width: 1.5 oscillator cycles min
Interrupt Pulse Width: 2 oscillator cycles min

Package Information

40-Pin DIP (Case 711-03)

Package Dimensions: 52.32mm x 13.97mm
Lead Pitch: 2.54mm
Lead Count: 40
Material: Plastic

42-Pin SDIP (Case 858-01)

Package Dimensions: 52.58mm x 15.24mm
Lead Pitch: 1.778mm
Lead Count: 42
Material: Plastic

Signal Descriptions

Power and Ground

VDD: Main power supply (4.5V to 5.5V)
VSS: Ground reference

Clock

EXTAL, XTAL: Crystal oscillator connections
OSC1, OSC2: Alternative clock input/output

Control Signals

RESET: Active-low reset input
IRQ/VPP: External interrupt/programming voltage

I/O Ports

PA0-PA7: 8-bit bidirectional I/O port
PB0-PB5: 6-bit bidirectional I/O port
PC0-PC7: Multiplexed I/O port with PWM and ADC functions
PD0-PD3: Multiplexed I/O port with communication functions

Special Function Signals

PWM0-PWM7: Pulse Width Modulation outputs
HSYNC, VSYNC: Horizontal and vertical sync inputs
ADC0-ADC3: Analog-to-digital converter inputs

CPU Core

The HC05 core features:

8-bit accumulator (A)
8-bit index register (X)
16-bit stack pointer (SP)
16-bit program counter (PC)
8-bit condition code register (CCR) with:
- Half Carry (H) flag
- Interrupt Mask (I) flag
- Negative (N) flag
- Zero (Z) flag
- Carry/Borrow (C) flag