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HMS77C1000A Datasheet(PDF) 9 Page - Hynix Semiconductor |
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HMS77C1000A Datasheet(HTML) 9 Page - Hynix Semiconductor |
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9 / 45 page  HMS77C1000A/HMS77C1001A 6 Oct. 2001 Ver. 2.0 5. PIN FUNCTION VDD: Supply voltage. VSS: Circuit ground. RESET: Reset the MCU. XIN: Input to the inverting oscillator amplifier and input to the internal main clock operating circuit. XOUT: Output from the inverting oscillator amplifier. RA0~RA3: RA is an 4-bit, CMOS, bidirectional I/O port. RA pins can be used as outputs or inputs according to “0” or “1” written the their Port Direction Register(TRISA). RB0~RB7: RB is a 8-bit, CMOS, bidirectional I/O port. RB pins can be used as outputs or inputs according to “0” or “1” written the their Port Direction Register(TRISB). EC0: EC0 is an external clock input to Timer0. It should be tied to VSS or VDD, if not in use, to reduce current con- sumption. Legend : I =input, O = output, I/O = input/output, P = power, - = Not used, TTL = TTL input, ST = Schmitt Trigger input PIN NAME DIP, SOP Pin No. SSOP Pin No. In/Out Input Levels Function VDD 14 15,16 P- Supply voltage VSS 55,6 P- Circuit ground RESET 44 IST Reset signal input/programming voltage input. This pin is an active low reset to the device. Voltage on the RESET pin must not exceed VDD to avoid unintended entering of programming mode. XIN 16 18 IST Oscillator crystal input/external clock source input XOUT 15 17 O- Oscillator crystal output. Connects to crystal or resonator in crystal oscilla- tor mode. In RC mode, XOUT pin outputs CLKOUT which has 1/4 the fre- quency of XIN, and denotes the instruction cycle rate. RA0 17 19 I/O TTL 4-bit bi-directional I/O ports RA1 18 20 I/O TTL RA2 1 1 I/O TTL RA3 2 2 I/O TTL RB0 6 7 I/O TTL 8-bit bi-directional I/O ports RB1 7 8 I/O TTL RB2 8 9 I/O TTL RB3 9 10 I/O TTL RB4 10 11 I/O TTL RB5 11 12 I/O TTL RB6 12 13 I/O TTL RB7 13 14 I/O TTL EC0 3 3 IST Clock input to Timer0. Must be tied to VDD or VSS, if not in use, to reduce current consumption. TABLE 5-1 PINOUT DESCRIPTION |
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