ST90R40 Datasheet (STMicroelectronics)

ST90R40, ROMLESS HCMOS MCU

Pin Name 1 AVss 2 AVss 3 NC 4 P44/AIN4 5 P57 6 P56 7 P55 8 P54 9 INT7 10 INTO 11 P53 12 NC 13 P52 14 P51 15 P50 16 OSCOUT 17 Vss 18 Vss 19 NC 20 OSCIN 21 RESET 22 P37/T10UTB 23 P36/T11NB 24 P35/T10UTA Pin Name 25 P34/T11NA 26 P33fTOOUTB 27 P32fTOINB 28 P31fTOOUTA 29 P30/P/DfTOINA 30 A15 31 A14 32

ST90R40 ROMLESS HCMOS MCU WITH EEPROM, RAM AND AID CONVERTER Register oriented 8/16 bit CORE with RUN, WFI and HALT modes Minimum instruction cycle time:500ns (12M Hz internal) ROMiess to allow maximum external memory flexibility Internal Memory : RAM 256 bytes EEPROM 512 bytes 224 general purpose registers available as RAM, accumulators or index pointers (register file) 80-pin Plastic Quad Flat Pack Package for ST90R40Q 68

ST90R40 Features

* 40 fully programmable 1/0 pins

* Up to 8 external plus 1 non-maskable interrupts

* 16 bit Timer with 8 bit Prescaler, able to be used as a Watchdog Timer

* Two 16 bit Multifunction Timers, each with an 8 bit prescaler and 13 operating modes

* 8 channel