8.5.1.1.1 Serial Register Write
The device internal register can be programmed with these steps:
- Drive the SEN pin low,
- Set the R/W bit to 0 (bit A15 of the 16-bit address),
- Set bit A14 in the address field to 1,
- Initiate a serial interface cycle by specifying the address of the register (A13 to A0) whose content must be written, and
- Write the 8-bit data that are latched in on the SCLK rising edge.
Figure 47 and Table 4 show the timing requirements for the serial register write operation.
Table 4. Serial Interface Timing(1)
|
MIN |
TYP |
MAX |
UNIT |
fSCLK |
SCLK frequency (equal to 1 / tSCLK) |
> dc |
|
20 |
MHz |
tSLOADS |
SEN to SCLK setup time |
25 |
|
|
ns |
tSLOADH |
SCLK to SEN hold time |
25 |
|
|
ns |
tDSU |
SDIO setup time |
25 |
|
|
ns |
tDH |
SDIO hold time |
25 |
|
|
ns |
(1) Typical values are at 25°C, full temperature range is from TMIN = –40°C to TMAX = 125°C, and AVDD = DVDD = 1.8 V, unless otherwise noted.