Memo fact sheet

Code : 1024 Bytes / EEPROM : 0 bytes / RAM : 32 Bytes
Size: about 3mm x 3mm legs included !! (0。0)
2 PWM on PB0 and PB1
Default speed : internal oscillator 8 MHz
Homepage http://www.atmel.com/devices/ATTINY10.aspx

Usage

Programming

The chip is so small it cannot use a SPI interface but uses instead the TPI (Tiny Programming Interface). For the AVR mkII programmer, explanation is here.

Top view of the connector on the circuit board - Pin 1 = red wire

REMINDER: once you program it, the program will not start running (!). You have to unplug the /RESET wire (connecting the Tiny10 to the AVR programmer) and you have to unplug the AVR ISP mkII from the USB (!!) Why? Maybe the /RESET line stays forced low. I tried to add a pullup but to no avail. This stays a mystery so far but the article here under in the links mentions the same problem...

Sample codes

All the source codes and samples programs in 1 solution : https://github.com/AlanFromJapan/alanarduinotools/tree/master/Attiny10

Random number generator in assembler

I found it here. Adapted it to use with Attiny10, it uses 4 registers r16-19. A bit more work and you could store the last value in SRAM instead, but I didn't need to so I let it as-is...

init_vars_rnd:
    ; init the value so it can be randomized
    ldi r16, 0xad
    ldi r17, 0xad
    ldi r18, 0xad
    ldi r19, 0xad
 
main:
    rjmp main ; your program here
 
; http://www.avrfreaks.net/forum/very-fastsmall-random-number-generator
; 31-bit random number
; primitive polynomial order 31
; (1)0100000 10101010 10010101 10110101 (20 AA 95 B5)
; shift before XOR
rand_31:
    push r24
 
    lsl    r16            ; shift first
    rol    r17
    rol    r18
    rol    r19
 
    sbrs    r19,7            ; test MSB
    rjmp    rand_31_outro            ; clear, no XOR
 
    ldi    r24,0xB5        ; first poly byte
    eor    r16,r24            ; XOR it in
    ldi    r24,0x95        ; second byte of poly
    eor    r17,r24
    ldi    r24,0xAA        ; same routine
    eor    r18,r24
    ldi    r24,0x20
    eor    r19,r24
 
rand_31_outro:
    pop r24
    ret

Watchdog

Took me some hours to get this one working, as usual nowhere to be found a simple helloworld version of the watchdog for Attiny10... well, there it is fixed now.
README: the fuse WDTON must be UNPROGRAMMED (=not checked), otherwise behavior is always to reset, not goto interrupt.

.CSEG
.ORG 0x0000
rjmp main        ;1 0x0000 RESET External Pin, Power-on Reset,VLM Reset, Watchdog Reset
rjmp neant        ;2 0x0001 INT0 External Interrupt Request 0
rjmp neant        ;3 0x0002 PCINT0 Pin Change Interrupt Request 0
rjmp neant        ;4 0x0003 TIM0_CAPT Timer/Counter0 Input Capture
rjmp neant        ;5 0x0004 TIM0_OVF Timer/Counter0 Overflow
rjmp neant        ;6 0x0005 TIM0_COMPA Timer/Counter0 Compare Match A
rjmp neant        ;7 0x0006 TIM0_COMPB Timer/Counter0 Compare Match B
rjmp neant        ;8 0x0007 ANA_COMP Analog Comparator
rjmp WDT_off    ;9 0x0008 WDT Watchdog Time-out
rjmp neant        ;10 0x0009 VLM VCC Voltage Level Monitor
rjmp neant        ;11 0x000A ADC ADC Conversion Complete (1)
 
; ---------------------------------------------------------
; a dummy handler for unused interrupts
neant:
    reti
 
main:    
    ;----------- Watchdog setup start ----------------------------------------
    ;No interrupts temporarily please
    cli
 
    ;no reset on watchdog! (clear bit WDRF in RSTFLR)
    in r16, RSTFLR
    andi r16, ~(1 << WDRF)
    out RSTFLR, r16
 
    ; WDP2 | WDP1 => every second %20 !WDE | WDIE => interrupt on watchdog timeout
    ldi r17, (1 << WDIE | 1 << WDP2 | 1 << WDP1 | 0 << WDE)
    ldi r16, 0xD8    ;0xD( magic value to write in CCP, and then within 4 cycles you can update WDTCSR
    out CCP, r16
    out WDTCSR, r17
    sei
    ;----------- Watchdog setup end ----------------------------------------
 
loop:
    nop ; main body
    rjmp loop
 
; Watchdog interrupt body
WDT_off:
    cli
    ;... do something every sec
    sei
    ;reti because it's an interrupt
    reti

ATtiny10