How you directly access serially chained devices, like LEDS, shift registers, etc?

[HenrikOlsson]

Each color value is 8 bit, so it is 6912 bytes, not bits But that's ok, I'll use external EEPROM as display buffer.
MSSP would be great, but no PBP support as far as I know - need to use ASM....

Say what? You start the thread about efficiency and then you're going to use external memory as display buffer?

There is zero need for any assembly code to operate the MMSP module (or the SPI module on the Q devices for that matter).