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MC908QT4ACFQE Datasheet(PDF) 57 Page - Freescale Semiconductor, Inc |
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MC908QT4ACFQE Datasheet(HTML) 57 Page - Freescale Semiconductor, Inc |
57 / 200 page MC68HC908QYA/QTA Family Data Sheet, Rev. 3 Freescale Semiconductor 57 Chapter 5 Configuration Register (CONFIG) 5.1 Introduction This section describes the configuration registers (CONFIG1 and CONFIG2). The configuration registers enable or disable the following options: • Stop mode recovery time (32 × BUSCLKX4 cycles or 4096 × BUSCLKX4 cycles) •STOP instruction • Computer operating properly module (COP) • COP reset period (COPRS): 8176 × BUSCLKX4 or 262,128 × BUSCLKX4 • Low-voltage inhibit (LVI) enable and trip voltage selection • Auto wakeup timeout period • Allow clock source to remain enabled in STOP • Enable IRQ pin • Disable IRQ pin pullup device • Enable RST pin 5.2 Functional Description The configuration registers are used in the initialization of various options. The configuration registers can be written once after each reset. Most of the configuration register bits are cleared during reset. Since the various options affect the operation of the microcontroller unit (MCU) it is recommended that this register be written immediately after reset. The configuration registers are located at $001E and $001F, and may be read at anytime. NOTE The CONFIG registers are one-time writable by the user after each reset. Upon a reset, the CONFIG registers default to predetermined settings as shown in Figure 5-1 and Figure 5-2. Bit 7 6 5 4 3 2 1 Bit 0 Read: IRQPUD IRQEN R R R R OSCENINSTOP RSTEN Write: Reset: 000 0 0 0 0 U POR: 000 0 0 0 0 0 R = Reserved U = Unaffected Figure 5-1. Configuration Register 2 (CONFIG2) |
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