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MC908QT4VPE Datasheet(PDF) 90 Page - Freescale Semiconductor, Inc |
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MC908QT4VPE Datasheet(HTML) 90 Page - Freescale Semiconductor, Inc |
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90 / 168 page  Oscillator Module (OSC) MC68HC908QY/QT Family Data Sheet, Rev. 6 90 Freescale Semiconductor Figure 11-1. Block Diagram Highlighting OSC Block and Pins 11.3.1 Internal Oscillator The internal oscillator circuit is designed for use with no external components to provide a clock source with tolerance less than ±25% untrimmed.An 8-bit trimming register allows adjustment to a tolerance of less than ±5%. The internal oscillator will generate a clock of 12.8 MHz typical (INTCLK) resulting in a bus speed (internal clock ÷ 4) of 3.2 MHz. 3.2 MHz came from the maximum bus speed guaranteed at 3 V which is 4 MHz.Since the internal oscillator will have a ±25% tolerance (pre-trim), then the +25% case should not allow a frequency higher than 4 MHz: 3.2 MHz + 25% = 4 MHz Figure 11-3 shows how BUSCLKX4 is derived from INTCLK and, like the RC oscillator, OSC2 can output BUSCLKX4 by setting OSC2EN in PTAPUE register. See Chapter 12 Input/Output Ports (PORTS) PTA0/AD0/TCH0/KBI0 PTA1/AD1/TCH1/KBI1 PTA2/IRQ/KBI2/TCLK PTA3/RST/KBI3 PTA4/OSC2/AD2/KBI4 PTA5/OSC1/AD3/KBI5 KEYBOARD INTERRUPT MODULE CLOCK GENERATOR (OSCILLATOR) SYSTEM INTEGRATION MODULE SINGLE INTERRUPT MODULE BREAK MODULE POWER-ON RESET MODULE 16-BIT TIMER MODULE COP MODULE MONITOR ROM PTB0 M68HC08 CPU PTB1 PTB2 PTB3 PTB4 PTB5 PTB6 PTB7 8-BIT ADC 128 BYTES RAM MC68HC908QY4 AND MC68HC908QT4 4096 BYTES MC68HC908QY2, MC68HC908QY1, MC68HC908QT2, AND MC68HC908QT1: 1536 BYTES USER FLASH POWER SUPPLY VDD VSS RST, IRQ: Pins have internal (about 30K Ohms) pull up PTA[0:5]: High current sink and source capability PTA[0:5]: Pins have programmable keyboard interrupt and pull up PTB[0:7]: Not available on 8-pin devices – MC68HC908QT1, MC68HC908QT2, and MC68HC908QT4 (see note in 12.1 Introduction) ADC: Not available on the MC68HC908QY1 and MC68HC908QT1 |
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