NEC UPD703116 User Manual page 491

(11) Serial I/O shift registers 0, 1 (SIO0, SIO1)
The SIOn register is a 16-bit shift register that converts parallel data into serial data (n = 0, 1).
The transfer operation is not started even if the SIOn register is read.
These registers are read-only, in 16-bit units.
In addition to reset input, this register can also be initialized by clearing (0) the CSICAEn bit of the CSIMn
register.
Caution Read the SIOn register only when the 16-bit data length has been set (CCL bit of CSIMn
register = 1), and only in the idle state (CSOTn bit of CSIMn register = 0). If the SIOn
register is read during data transfer, the data cannot be guaranteed.
15 14 13 12
SIO0 SIO15 SIO14 SIO13 SIO12
15 14 13 12
SIO1 SIO15 SIO14 SIO13 SIO12
Bit position Bit name
15 to 0 SIO15 to
SIO0
CHAPTER 10 SERIAL INTERFACE FUNCTION
11 10 9 8 7 6
SIO11 SIO10 SIO9 SIO8 SIO7 SIO6
11 10 9 8 7 6
SIO11 SIO10 SIO9 SIO8 SIO7 SIO6
Data is shifted in (reception) or shifted out (transmission) from the MSB or LSB
side.
User's Manual U14492EJ5V0UD
5 4 3 2 1 0
SIO5 SIO4 SIO3 SIO2 SIO1 SIO0
5 4 3 2 1 0
SIO5 SIO4 SIO3 SIO2 SIO1 SIO0
Function
Address Initial value
FFFFF90AH 0000H
Address Initial value
FFFFF91AH 0000H
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