HT49RV9 datasheet(21/48 Pages) HOLTEK

21 / 48 page

HT49RV9/HT49CV9

Rev. 1.00

April 20, 2006

Serial Interface

The Serial Interface function has four basic signals included. They are the SDI (serial data input), SDO (serial data out-

put), SCK (serial clock) and SCS (slave select pin).

Two registers (SBCR & SBDR) unique to the serial interface provide control, status and data storage.

· SBCR: Serial bus control register

¨ Bit 7 (CKS): clock source selection:

fSIO=fSYS/4 or fRTCOSC

¨ Bit 6 (M1), Bit 5 (M0): master/slave mode & baud

rate selection

- M1, M0:

00: master mode, baud rate=fSIO

01: master mode, baud rate=fSIO/4

10: master mode, baud rate=fSIO/16

11: slave mode

¨ Bit 4 (SBEN): serial bus enable/disable (1/0)

- Enable: (SCS dependent on CSEN bit)

Disable

® enable: SCK, SDI, SDO, SCS=0 and

waiting for writing data to SBDR (TXRX buffer)

Master mode: write data to SBDR (TXRX buffer)

® start transmission/reception automatically

Master mode: when data has been transferred

set TRF

Slave mode: when a SCK (and SCS dependent

on CSEN) is received, data in TXRX buffer is

shifted-out and data on SDI is shifted-in

D 7 / D 0

D 6 / D 1

D 5 / D 2

D 4 / D 3

D 3 / D 4

D 2 / D 5

D 1 / D 6

D 0 / D 7

D 7 / D 0

D 6 / D 1

D 5 / D 2

D 4 / D 3

D 3 / D 4

D 2 / D 5

D 1 / D 6

D 0 / D 7

S C K

S D I

S D O

S C S

S B E N = C S E N = 1

S B E N = 1 , C S E N = 0 ( i f p u l l - h i g h e d )

SIO Timing (SIOCLK Configuration is Falling Edge)

D 7 / D 0

D 6 / D 1

D 5 / D 2

D 4 / D 3

D 3 / D 4

D 2 / D 5

D 1 / D 6

D 0 / D 7

D 7 / D 0

D 6 / D 1

D 5 / D 2

D 4 / D 3

D 3 / D 4

D 2 / D 5

D 1 / D 6

D 0 / D 7

S C K

S D I

S D O

S C S

S B E N = C S E N = 1

S B E N = 1 , C S E N = 0 ( i f p u l l - h i g h e d )

SIO Timing (SIOCLK Configuration is Rising Edge)

Bit No.

Label

Function

Unused bit, read as

²0²

WCOL

This bit shows the situation of the buffer SBDR

1: enable (set by SIO) writing to SBDR

0: disable (cleared by user) reading from SBDR

CSEN

Serial bus selection signal

MLS

Shift first control bit (1: MSB; 0: LSB)

SBEN

Serial bus selection (1: enable; 0: disable)

5, 6

M0, M1

Master/slave mode selection: M1, M0=

00: master mode, baud rate=fSIO

01: master mode, baud rate=fSIO/4

10: master mode, baud rate=fSIO/16

11: slave mode

CKS

Clock source selection (0: fSYS/4; 1: fRTCOSC)

SBCR (1FH) Register

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