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MC68HC908QF4

Features: • High-performance M68HC08 architecture• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families• Operating voltage range of 2.2 to 3.6 V• Maximum internal bus frequency of 2 MHz• Trimmable internal oscillator 4-MHz operating frequency ...

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MC68HC908QF4: Features: • High-performance M68HC08 architecture• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families• Operating voltage range of 2.2 to 3.6 V• Max...

MC68HC908QF4 Data Sheet

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Part Number:
MC68HC908QF4
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/27

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Product Details

Description



Features:

• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
• Operating voltage range of 2.2 to 3.6 V
• Maximum internal bus frequency of 2 MHz
• Trimmable internal oscillator
4-MHz operating frequency for a 1-MHz bus frequency
8-bit trim capability allows 0.4% accuracy(1)
±25 percent accuracy untrimmed
• Auto wakeup from STOP capability
• 4096 bytes of on-chip FLASH memory
• FLASH program memory security(2)
• 128 bytes of on-chip RAM
• 16-bit, 2-channel timer interface module (TIM)
• 4 channel, 8-bit analog-to-digital converter (ADC)
• 13 general-purpose input/output (I/O) ports:
Six shared with keyboard wakeup function
Three shared with the timer module, IRQ
Port A pins have 3-mA sink capabilities
• Low-voltage inhibit (LVI) module with selectable trip points:
2.12 V detection forces MCU into reset
2.32 V detection sets indicator flag
• 6-bit keyboard interrupt with wakeup feature (KBI)
• External asynchronous interrupt pin with internal pullup (IRQ)
• Ultra high frequency (UHF) RF transmitter:
Ultra low sleep mode current
ASK and FSK modulation selectable
• System protection features:
Computer operating properly (COP) reset
Low-voltage detection with reset
Illegal opcode detection with reset
Illegal address detection with reset
• 32-pin plastic LQFP package
• Power saving stop and wait modes
• Master reset pin (RST) shared with general-purpose I/O pin Features of the CPU08 include:
• 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
• Third party C language support


Pinout

Connection Diagram


Specifications

Characteristic(1)
Symbol
Value
Unit
Supply voltage
VDD
0.3 to +6.0
V
Input voltage
VIN
VSS 0.3 to VDD +0.3
V
Mode entry voltage,IRQ pin
VTST
VSS 0.3 to +9.1
V
Maximum current per pin excluding
PTA0PTA5,VDD,and VSS
I
±15
mA
Maximum current for pins PTA0PTA5
IPTA0-IPTA5
±25
mA
Storage temperature
TSTG
55 to +150
°C
Maximum current out of VSS
IMVSS
100
mA
Maximum current into VDD
IMVDD
100
mA
1. Voltages references to VSS.


Description

The function of the auto wakeup logic MC68HC908QF4 is to generate periodic wakeup requests to bring the microcontroller unit (MCU) out of stop mode. The wakeup requests are treated as regular keyboard interrupt requests, with the difference that instead of a pin, the interrupt signal is generated by an internal logic.

Writing the AWUIE bit of MC68HC908QF4 in the keyboard interrupt enable register enables or disables the auto wakeup interrupt input (see Figure 4-2). A logic 1 applied to the AWUIREQ input with auto wakeup interrupt request enabled, latches an auto
wakeup interrupt request.

Auto wakeup latch, AWUL, can be read directly from the bit 6 position of port A data register (PTA). MC68HC908QF4 is a read-only bit which is occupying an empty bit position on PTA. No PTA associated registers, such as PTA6 data direction or PTA6 pullup exist for this bit.

Entering stop mode of MC68HC908QF4 will enable the auto wakeup generation logic. An internal RC oscillator (exclusive for the auto wakeup feature) drives the wakeup request generator. Once the overflow count is reached in the generator counter, a wakeup request, AWUIREQ, is latched and sent to the KBI logic. See Figure 4-1.

Wakeup interrupt requests will only be serviced if the associated interrupt enable bit, AWUIE MC68HC908QF4, in KBIER is set. The AWU shares the keyboard interrupt vector.




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