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EM6605WW11 Datasheet(PDF) 10 Page - EM Microelectronic - MARIN SA |
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EM6605WW11 Datasheet(HTML) 10 Page - EM Microelectronic - MARIN SA |
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10 / 43 page  EM6605 03/01 REV. C/441 *Copyright 2002, EM Microelectronic-Marin SA 10 www.emmicroelectronic.com 6.INPUT and OUTPUT ports The EM6605 has four independent 4-bit ports, as shown in Table 9. Table 10.Input / Output Ports Overview Port Mode Mask Options Function(s) PA(0:3) Input Pull-Up/Down (*) Debouncer (*) + or - IRQ edge RESET combination Input Interrupt Software Test Variable PA3 input for event counter RESET input(s) PB(0:3) Individual input or output Nch open drain output Pull-Up/Down on input Input or Output PB0 for buzzer output PC(0:3) Port input or output Pull-Up/Down (*) + or - IRQ edge (*) Debouncer Nch open drain output Input or Output Port Interrupt PD(0:3) Port input or Output Pull-Up/Down on Input Nch open drain output Input or Output Port PD0 -SWB serial clock output PD1 -SWB serial data output (*) Some options can be set also by Option Register . Table 11.Option register - Option Bit Name Reset R/W Description 3 IRQedgeR 0 R/W Rising edge interrupt for portA&C 2 debPCN 0 R/W PortC without/with debouncer 1 debPAN 0 R/W PortA without/with debouncer 0 NoWD 0 R/W WatchDog timer Off IRQedgeR - Valid for both PortA and PortC input interrupt edge. At RESET it is cleared to 0 selecting the falling edge at the input as the interrupt source. When set to 1 the rising edge is active. (Option 2 on Fig.6 and Fig.8) debPAN - by default after reset it is 0 enabling the debouncers on whole portA. Writing it to 1 removes the debouncers from the PortA. (Option 2 on Fig.6) debPCN - by default after reset it is 0 enabling the debouncers on whole portC. Writing it to 1 removes the debouncers from the PortC. (Option 2 on Fig.8) NoWD - by default after reset it is 0 = Watchdog timer is On. Writing it to 1 removes the WatchDog timer. 6.1.PortA The EM6605 has one four bit general purpose input port. Each of the input port terminals PA3..PA0 has an internal Pull-Up/Down resistor which can be selected with mask options. Port information is read directly from the pin into a register. On inputs PA0, PA1, PA2 and PA3 debouncers for noise rejection are added by default. For interrupt generation, one can choose between either direct input or debounced input. With the debPAN bit at 0 in the Option register all the PortA inputs are debounced and with the debPAN bit at 1 none of the PortA inputs are debounced. With the debouncer selected the input must be stable during two rising edges of ck[11] or ck[8] clocks (1024Hz or 128Hz (*f1) at 32kHz). This corresponds to a worst case of tdebS or tdebL shown in table 6. PortA terminals PA0, PA1 and PA2 are also used as input conditions for conditional software branches as shown on the next page: |
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