HT56R656 datasheet(57/108 Pages) HOLTEK

57 / 108 page

HT56R62/HT56R65

HT56R642/HT56R644/HT56R654/HT56R656

Rev. 1.00

July 20, 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

¨ 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 cer-

tain 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 or I/O pins

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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