HT45F43 datasheet(83/152 Pages) HOLTEK

83 / 152 page

The status of the SPI interface pins is determined by a number of factors such as whether the device is

in the master or slave mode and upon the condition of certain control bits such as CSEN and SIMEN.

There are several configuration options associated with the SPI interface. One of these is to enable the

SIM function which selects the SIM pins rather than normal I/O pins. Note that if the configuration

option does not select the SIM function then the SIMEN bit in the SIMC0 register will have no effect.

Another two SPI configuration options determine if the CSEN and WCOL bits are to be used.

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

2C interface.

Bit

76543210

SIMC0

SIM2

SIM1

SIM0

PCKEN

PCKP1

PCKP0

SIMEN

SIMD

SIMC2

CKPOLB

CKEG

MLS

CSEN

WCOL

TRF

SIM Registers List

The SIMD register is used to store the data being transmitted and received. The same register is used

by both the SPI and I

2C functions. Before the device writes data to the SPI bus, the actual data to 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.

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

September 15, 2011

D a t a B u s

S D I P i n

S D O P i n

S I M D

T x / R x S h i f t R e g i s t e r

B u s y

S t a t u s

C o n f i g u r a t i o n

O p t i o n

T R F F l a g

E n a b l e / D i s a b l e

W C O L F l a g

C l o c k

E d g e / P o l a r i t y

C o n t r o l

C l o c k

S o u r c e S e l e c t

f S Y S

f S U B

T i m e r 0 o u t p u t / 2

S C K P i n

S C S P i n

C o n f i g u r a t i o n

O p t i o n

C S E N b i t

E n a b l e / D i s a b l e

C K E G b i t

C K P O L B b i t

SPI Block Diagram

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