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SM89S16R1C40 Datasheet(PDF) 5 Page - SyncMOS Technologies,Inc |
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SM89S16R1C40 Datasheet(HTML) 5 Page - SyncMOS Technologies,Inc |
5 / 28 page SyncMOS Technologies Inc. SM89S16R1 8-Bits Micro-controller With 64KB Flash ROM & IKB RAM & RTC & ADC & PWM & PDWU embedded Specifications subject to change without notice contact your sales representatives for the most recent information. SM89S16R1 V1.0 JANUARY 2005 5 MNEMONIC PDIP 40 pin PQFP 44 Pin PLCC 44 pin Names and Functions P3.0 – P3.7 10,11,12,13 14,15,16,17 5,7,8,9, 10,11,12,13 11, 13,14,15, 16,17,18,19 Port 3: Port 3 is an 8-bits bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 3 pins that are externally being pulled low will source current because of the pull-ups. (See DC Electrical Characteristics: IIL). Port 3 also serves the special features. Port Pin Alternative function P3.0 RxD UART input P3.1 TxD UART output P3.2 #EX0 external interrupt 0 P3.3 #EX1 external interrupt 1 P3.4 T0: Timer 0 external input P3.5 T1: Timer 1 external input P3.6 #WR External data memory write strobe P3.7 #RD External data memory read strobe ALE/X32OUT 30 27 33 Address Latch Enable: Output pulse for latching the low byte of the address during an access to external memory. In normal operation, ALE is emitted twice every machine cycle, and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to external data memory. Setting SFR SCONF.0 can disable ALE. With this bits set, ALE will be active only during a MOVX instruction. X32OUT: The 32.768KHz crystal output for RTC function. #PSEN/X32IN 29 26 32 Program Store Enable: The read strobe to external program memory. When executing code from the external program memory, #PSEN is activated twice each machine cycle, except that two #PSEN activations are skipped during each access to external data memory. #PSEN is not activated during fetches from internal program memory. X32IN: The 32.768KHz crystal input for RTC function. #EA 31 29 35 External Access Enable: #EA must be externally held low to enable the device to fetch code from external program memory locations. If #EA is held high, the device executes from internal program memory. X1 19 15 21 Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. X2 18 14 20 Crystal 2: Output from the inverting oscillator amplifier. |
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