Holtek HT67F2350 Manual page 181

HT67F2350/HT67F2360
HT67F2370/HT67F2390
Advanced A/D Flash MCU with LCD & EEPROM
PTM0 CCRP match frequency/2
SPI Registers
There are three internal registers which control the overall operation of the SPI interface. These are
the SIMD data register and two registers SIMC0 and SIMC2. Note that the SIMC1 register is only
used by the I C interface.
2
Register
Name
7
SIMC0 SIM2
SIMC2 D7
SIMD D7
• SIMD Register
The SIMD register is used to store the data being transmitted and received. The same register is used
by both the SPI and I
be transmitted must be placed in the SIMD register. After the data is received from the SPI bus, the
device can read it from the SIMD register. Any transmission or reception of data from the SPI bus
must be made via the SIMD register.
Bit 7
Name D7
R/W R/W
POR x
Rev. 1.60
SPI Master
SCK
SDO
SDI
SCS
SPI Master/Slave Connection
SIMD
SDI Pin TX/RX Shift Register
Clock
CKEG
Edge/Polarity
CKPOLB
Control
SCK Pin
f
Clock
SYS
f Source
SUB
Select
SCS Pin
CSEN
SPI Block Diagram
6 5 4
SIM1 SIM0 —
D6 CKPOLB CKEG
D6 D5 D4
SPI Registers List
C functions. Before the device writes data to the SPI bus, the actual data to
2
6 5 4
D6 D5 D4
R/W R/W R/W
x x x
181
SPI Slave
SCK
SDI
SDO
SCS
Data Bus
SDO Pin
WCOL Flag
Busy Status
TRF Flag
ICF Flag
Bit
3 2 1
SIMDEB1 SIMDEB0 SIMEN
MLS CSEN WCOL
D3 D2 D1
3 2 1
D3 D2 D1
R/W R/W R/W
x x x
May 16, 2019
0
SIMICF
TRF
D0
0
D0
R/W
x
"x": unknown