38
edits
Changes
Add notes on ST7 pins
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|3
|<nowiki>U3 - ICCLK | Pin29 / PC6 / SCK / ICCCLKTP33 | U21 - Pin21 / PCLK</nowiki>
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|4
|U3 - Pin38/Vpp/ICCSEL|Programmer probably has a 5->12v charge pump for this. Do not apply 12v willy-nilly, will blow chip.
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|5
|U3 - Pin39/RESET
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|6
|U3 - Pin27 / PC4 / MISO / ICCDATA
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|12
|U21 - Pin 20 - DCLK|3.3v - 2.5KHz 4800Hz square wave (4msec p, clocks the serial dataThis is probably not directly connected to U21/p)DCLK which is 5V.
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|13
|26
|GPS Data (38400 BPS)
|Data bursts
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|31
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|38
|U3 - Pin18 / OCMP1_A / AIN10 / PF4
|Square wave data bursts, 0.2msec per bit
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|40
|Battery voltage
|Around 9VDC measured, 3x3V batteries
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|5
|Output
|Data. Square wave. 5V space, 0v mark? Pulses around 250msec per bit. Perhaps this is a capacitance or resistance to frequency converter.
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|6