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HC705JJ7GRS/D 数据表(PDF) 133 Page - NXP Semiconductors |
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HC705JJ7GRS/D 数据表(HTML) 133 Page - NXP Semiconductors |
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133 / 230 page  Analog Subsystem Voltage Comparator Features MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 General Release Specification Analog Subsystem 8.8 Voltage Comparator Features The two internal comparators can be used as simple voltage comparators if set up as described in Table 8-8. Both comparators can be active in the Wait mode; and can directly restart the part by means of the analog interrupt. Both comparators can also be active in the stop mode, but cannot directly restart the part. However, the comparators can directly drive PB4 which can then be connected externally to activate either a port interrupt on the PA0:3 pins or the IRQ/VPP pin. 8.8.1 Voltage Comparator 1 Voltage comparator 1 is always connected to two of the port B I/O pins. These pins should be configured as inputs and have their software programmable pulldowns disabled. Also, the negative input of voltage comparator 1 is connected to the PB3/AN3/TCAP and shared with the input capture function of the 16-bit programmable timer. Therefore, the timer input capture interrupt should be disabled so that changes in the voltage on the PB3/AN3/TCAP pin do not cause unwanted input capture interrupts. The output of comparator 1 can be connected to the port logic driving the PB4/AN4/TCMP/CMP1 pin such that the output of the comparator is ORed with the PB4 data bit and the OLVL bit from the 16-bit timer. This capability requires that the OPT bit is set in the COPR at location $1FF0 and the COE1 bit is set in the ASR at location $001E. Table 8-8. Voltage Comparator Setup Conditions Comparator Current Source Enable Discharge Device Disable Port B Pin as Inputs Port B Pin Pulldowns Disabled Prog. Timer Input Capture Source 1 Not Affected Not Affected DDRB2 = 0 DDRB3 = 0 PDIB2 = 1 PDIB3 = 1 Not Affected 2 ISEN = 0 ISEN = 0 DDRB0 = 0 DDRB1 = 0 PDIB0 = 1 PDIB1 = 1 ICEN = 0 IEDG = 1 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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