Описание
The MC68HC908JB8 is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs). All MCUs in the family use the enhanced M68HC08 central processor unit (CPU08) and are available with a variety of modules, memory sizes and types, and package types.
- 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: PTB0–PTB7
- Port C is 8 bits: PTC0–PTC7
- Port D is 8 bits: PTD0–PTD7
- Port E is 5 bits: PTE0–PTE4; 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: PTD0–PTD6
- Port E is 5 bits: PTE0–PTE4; 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
