2014-01-12 01:39:14 +01:00
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STC89
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This is the first generation protocol of STC MCUs.
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Differences to STC12:
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* Uses NONE parity instead of EVEN parity.
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2014-01-23 23:55:41 +01:00
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* Status packet is sent without frame start magic.
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* Checksum calculations are different: a single-byte modular sum is used.
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2014-01-12 01:39:14 +01:00
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* Baudrate handshake isn't initiated with a type 0x50 packet; this is simply
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skipped.
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* After the handshake a special ping-pong sequence of 0x80 type packets needs
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to be sent.
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This doesn't appear to serve any purpose - possibly this is just done to
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verify that the connection works reliably. STC12 doesn't require it anymore
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because parity and the improved checksum ensure correct operation.
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* Erase is acknowledged with type 0x80 packet instead of type 0x00
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* After flash programming, there is no finish packet, type 0x69, sent; this
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is simply skipped.
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* Baudrate handshake
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2014-01-23 23:55:41 +01:00
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- Uses normal speed (/32) UART timing in 12T mode and double speed (/16)
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in 6T mode
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2014-01-12 01:39:14 +01:00
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- IAP delay has some differences (see datasheet)
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* Erase procedure
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- A different magic sequence is used
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(6 bytes with value 0x33)
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2014-01-23 23:55:41 +01:00
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- Only a single size is supplied
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2014-01-12 01:39:14 +01:00
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- response code has type 0x80
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2014-01-23 23:55:41 +01:00
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* Options
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- Only a single option byte exists
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