SIC63616-(Rev. 1.0) NO. P133
3240-0412
ESREADY: P23 port function select register (FF5AH•D1)
Selects the P23 port function when ENCS = "1".
When "1" is written: SRDY output
When "0" is written: SS input
Reading: Valid
The P23 port function can be selected from SRDY output and SS input in slave mode (SMOD = "0").
At initial reset, this register is set to "0".
Table 4.10.8.4 Selecting P23 port function
P23 terminal
P23 (I/O)
SS (I)
SRDY (O)
ESREADY
*
0
1
ENCS
0
1
1
Slave mode: SMOD = "0"
P23 terminal
P23 (I/O)
P23 (I/O)
Prohibited
ESREADY
*
0
1
ENCS
0
1
1
Master mode: SMOD = "1"
SD0–SD3, SD4–SD7: Serial interface data register (FF5BH, FF5CH)
These registers are used for writing and reading serial data.
• When writing
When "1" is written: High level
When "0" is written: Low level
Write data to be output in these registers. The register data is converted into serial data and output from the
SOUT (P21) terminal; data bits set at "1" are output as high (V
DD
) level and data bits set at "0" are output as
low (V
SS
) level.
• When reading
When "1" is read:
High level
When "0" is read:
Low level
The serial data input from the SIN (P22) terminal can be read from these registers.
The serial data input from the SIN (P22) terminal is converted into parallel data, as a high (V
DD
) level bit
into "1" and as a low (V
SS
) level bit into "0", and is loaded to these registers. Perform data reading only
while the serial interface is not running (i.e., the synchronous clock is neither being input or output).
At initial reset, these registers are undefined.
EISIF: Interrupt mask register (FFEAH•D0)
Masking the interrupt of the serial interface can be selected with this register.
When "1" is written: Enabled
When "0" is written: Masked
Reading: Valid
With this register, it is possible to select whether the serial interface interrupt is to be masked or not.
At initial reset, this register is set to "0".