Internal Port Decoding b8-15 Register

From SpecNext official Wiki
Revision as of 08:49, 12 November 2019 by Ped7g (talk | contribs) (core 3.0 changes/refresh)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search
Number $83
Readable Yes
Writable Yes
Short Description Enabling internal ports
Bit Description
7 (bit 15) Enabling Layer 2 Access Port ($123B / 4667)
6 (bit 14) Enabling Sprite Attribute Upload ($xx57 / 87), Sprite Pattern Upload ($xx5B / 91) and Sprite Status/Slot Select ($303B / 12347)
5 (bit 13) Enabling Kempston Mouse Buttons ($FADF / 64223), Kempston Mouse X ($FBDF / 64479) and Kempston Mouse Y ($FFDF / 65503)
4 (bit 12) Enabling UART TX ($133B / 4923), UART RX ($143B / 5179) and UART Control ($153B / 5435) (UART)
3 (bit 11) Enabling ($xxE7) and ($xxEB) (SPI)
2 (bit 10) Enabling I2C clock ($103B / 4155) and I2C data ($113B / 4411)
1 (bit 9) Enabling Multiface (two variable ports)
0 (bit 8) Enabling ($xxE3) (DivMMC control)

All bits are set to 1 upon soft reset.

(note: Next registers with number higher than $7F are inaccessible from Copper code)