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■ Saturn keyboard
- The Saturn keyboard is a 3-wire handshake peripheral.
∙ Start when TH is set to 0B, and end when both TH and TR are set to 1B.
The first data is the Mega Drive ID acquisition phase. Data can be obtained by changing TH from 1B to 0B. Read R, L, D, U after 2μS after TH change.
Please obtain the following data by handshaking with TR and TL.
Table 3.38 shows the Saturn keyboard data format in SH-2 direct mode.
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