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S80L186EB16 Datasheet(PDF) 39 Page - InnovASIC, Inc |
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S80L186EB16 Datasheet(HTML) 39 Page - InnovASIC, Inc |
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39 / 85 page  IA186EB/IA188EB Data Sheet 8-Bit/16-Bit Microcontrollers July 10, 2011 IA211080314-13 http://www.Innovasic.com UNCONTROLLED WHEN PRINTED OR COPIED Customer Support: Page 39 of 85 1-888-824-4184 Table 8. IA188EB Pin/Signal Descriptions (Continued) Signal Pin Description Name PLCC LQFP PQFP pdtmr pdtmr 36 24 67 Power-down timer. Input/Output (push-pull). Note: The IA188EB enters Powerdown Mode when the PWRDN bit in the Power Control Register is set to 1 and a HALT instruction is executed. Exit from the Powerdown Mode occurs upon receipt of a non-maskable interrupt (i.e., assertion of the nmi input) or a reset (i.e., assertion of the resin_n input). The pdtmr pin, which is normally connected to an external capacitor, determines the amount of time that the IA188EB waits before resuming normal operation after an exit from the Powerdown when a non-maskable interrupt is received —essentially a delay between the assertion of the nmi input and the enabling of the IA188EB internal clocks. The delay required depends on the start-up characteristics of the crystal oscillator. The pdtmr pin does not apply when the Powerdown Mode is exited by the receipt of a reset (i.e., the assertion resin_n). rd_n rd_n 4 73 36 read. Output. Active Low. When asserted (low), rd_n indicates that the accessed memory or I/O device must drive data from the location being accessed onto the data bus. ready ready 18 6 49 ready. Input. Active High. When asserted (high) the ready line indicates the completion of a bus cycle. This signal must be active to terminate any bus cycle unless the IA188EB Chip-Select Unit is configured to ignore ready. resin_n resin_n 37 25 68 reset input. Input. Active Low. When resin_n is asserted (low), the IA188EB immediately terminates any bus cycle in progress and assumes an initialized state. All pins are driven to a known state, and resout (see next table entry) is asserted. resout resout 38 26 69 reset output. Output. Active High. When resout is asserted, it indicates that the IA188EB is being reset. The resout signal will remain active (high) as long as resin_n remains active (low). rfsh_n rfsh_n 7 76 39 refresh. Output. Active Low. When rfsh_n is asserted (low), it indicates that a refresh cycle is in progress. |
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