MC68HC08JT8 General Description
MC68HC08JT8 Maximum Ratings
MC68HC08JT8 Features
Features of the MC68HC908JB8 include:
• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
• 3-MHz internal bus frequency
• 8,192 bytes of on-chip FLASH memory
• 256 bytes of on-chip random-access memory (RAM)
• FLASH program memory security1
• On-chip programming firmware for use with host PC computer
• Up to 37 general-purpose 3.3V input/output (I/O) pins, including:
13 or 10 shared-function I/O pins, depending on package
24, 8, or 2 dedicated I/O pins, depending on package
8 keyboard interrupts on port A, on all packages
10mA sink capability for normal LED on 4 pins
25mA sink capability for infrared LED on 2 pins
10mA sink capability for PS/2 connection on 2 pins (with USB module disabled)
• 16-bit, 2-channel timer interface module (TIM) with selectable input capture, output compare, PWM capability on each channel, and external clock input option (TCLK)
• Full Universal Serial Bus Specification 1.1 low-speed functions:
1.5 Mbps data rate
On-chip 3.3V regulator
Endpoint 0 with 8-byte transmit buffer and 8-byte receive buffer
Endpoint 1 with 8-byte transmit buffer
Endpoint 2 with 8-byte transmit buffer and 8-byte receive buffer
• System protection features:
Optional computer operating properly (COP) reset
Optional low-voltage detection with reset
Illegal opcode detection with reset
Illegal address detection with reset
• Low-power design (fully static with stop and wait modes)
• Master reset pin with internal pullup and power-on reset
• External interrupt pin with programmable internal pullup (IRQ)
• 44-pin quad flat pack (QFP), 28-pin small outline integrated circuit package (SOIC), 20-pin small outline integrated circuit package (SOIC), and 20-pin plastic dual in-line package (DIP)
• Specific features of MC68HC908JB8 in 44-pin are:
Port B is 8 bits: PTB0PTB7
Port C is 8 bits: PTC0PTC7
Port D is 8 bits: PTD0PTD7
Port E is 5 bits: PTE0PTE4; 2-channel TIM module with TCLK input option
• Specific features of MC68HC908JB8 in 28-pin are:
Port B is not available
Port C is only one bit: PTC0
Port D is only 7 bits: PTD0PTD6
Port E is 5 bits: PTE0PTE4; 2-channel TIM module with TCLK input option
• Specific features of MC68HC908JB8 in 20-pin are:
Port B is not available
Port C is only one bit: PTC0
Port D is only one bit: PTD0/1; internal PTD0 and PTD1 pads are bonded together to a single pin, PTD0/1
Port E is only 3 bits: PTE1, PTE3, and PTE4; 1-channel TIM module without TCLK input option
Features of the CPU08 include the following:
• Enhanced HC05 programming model
• Extensive loop control functions
• 16 addressing modes (eight more than the HC05)
• 16-bit index register and stack pointer
• Memory-to-memory data transfers
• Fast 8 * 8 multiply instruction
• Fast 16/8 divide instruction
• Binary-coded decimal (BCD) instructions
• Optimization for controller applications
• Efficient C language support
MC68HC08JT8 Connection Diagram
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