HT45R37 datasheet(39/99 Pages) HOLTEK

39 / 99 page

HT45R37

Rev. 1.00

June 25, 2009

D a t a B u s

S D I P i n

S D O P i n

S I M D R

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 / E v e n t C o u n t e r

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 N b i t

C K P O L b i t

SPI Block Diagram

¨ LSB first or MSB first data transmission modes

¨ Transmission complete flag

¨ Rising or falling active clock edge

¨ WCOL and CSEN bit enabled or disable select

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, SIMEN and SCS. In the table

I, Z represents an input floating condition.

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

SIMCTL0 register will have no effect. Another two SIM

configuration options determine if the CSEN and WCOL

bits are to be used.

Configuration Option

Function

SIM Function

SIM interface enable/disable

SPI CSEN bit

Enable/Disable

SPI WCOL bit

Enable/Disable

SPI Interface Configuration Options

SPI Registers

There are three internal registers which control the over-

all operation of the SPI interface. These are the SIMDR

data register and two control registers SIMCTL0 and

SIMCTL2. Note that the SIMCTL1 register is only used

by the I

2C interface.

Master/Salve

SIMEN=0

Master

- SIMEN=1

Slave

- SIMEN=1

CSEN=0

CSEN=1

CSEN=0

CSEN=1

SCS=0

CSEN=1

SCS=1

SCS

ZLZ

I, Z

SDO

OOOO

SDI

I, Z

SCK

H: CKPOL=0

L: CKPOL=1

H: CKPOL=0

L: CKPOL=1

I, Z

Note:

²Z² floating, ²H² output high, ²L² output low, ²I² Input, ²O²output level, ²I,Z² input floating (no pull-high)

SPI Interface Pin Status

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