Holtek HT67F2350 Manual page 185

HT67F2350/HT67F2360
HT67F2370/HT67F2390
Advanced A/D Flash MCU with LCD & EEPROM
SCS
SCK (CKPOLB=1)
SCK (CKPOLB=0)
SDO
SDI Data Capture
SPI Transfer
Master
Master or Slave
?
SIM[2:0]=000, 001,
010, 011 or 100
Configure CKPOLB,
CKEG, CSEN and MLS
SIMEN=1
A
Rev. 1.60
D7/D0 D6/D1 D5/D2
Write to SIMD
(SDO changes as soon as writing occurs; SDO is floating if SCS=1)
Note: For SPI slave mode, if SIMEN=1 and CSEN=0, SPI is always
enabled and ignores the SCS level.
SPI Slave Mode Timing – CKEG=1
Clear WCOL
Slave
SIM[2:0]=101
SPI Transfer Control Flow Chart
185
D4/D3 D3/D4 D2/D5 D1/D6 D0/D7
A
Write Data
into SIMD
Y
WCOL=1?
N
Transmission
N
completed?
(TRF=1?)
Y
Read Data
from SIMD
Clear TRF
Transfer
finished?
Y
END
May 16, 2019
N