ST6391 datasheet(36/68 Pages) STMICROELECTRONICS

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HWDR

Hardware Activated Watchdog Register

(D8h, Read/ Write)

D7 D6 D5 D4 D3 D2 D1 D0

C = Watchdog Activation Bit

SR = Software Reset Bit

T1-T6 = Counter Bits

Figure 39. Watchdog Register

HARDWARE ACTIVATED DIGITAL WATCHDOG

FUNCTION (Continued)

T1-T6. These are the watchdog counter bits. It

should be noted that D7 (T1) is the LSB of the

counter and D2 (T6) is the MSB of the counter,

these bits are in the opposite order to normal.

SR. This bit is set to one during the reset phase

and will generate a software reset if cleared to

zero.

C. This is the watchdog activation bit that is hard-

ware set. The watchdog function is always acti-

vated independently of changes of value of this bit.

The register reset value is FEh (Bit 1-7 set to one,

Bit 0 cleared).

SERIAL PERIPHERAL INTERFACE

The ST639x Serial Peripheral Interface (SPI) has

been designed to be cost effective and flexible in

interfacing the various peripherals in TV applica-

tions.

It maintains the software flexibility but adds hard-

ware configurations suitable to drive devices which

require a fast exchange of data. The three pins

dedicated for serial data transfer (single master

only) can operate in the following ways:

- as standard I/O lines (software configuration)

- as S-BUS or as I

2CBUS (two pins)

- as standard (shift register) SPI

When using the hardware SPI, a fixed clock rate of

62.5kHz is provided.

It has to be noted that the first bit that is output on

the data line by the 8-bit shift register is the MSB.

SPI Data/Control Registers

For I/O details on SCL (Serial Clock), SDA (Serial

Data) and SEN (Serial Enable) please refer to I/O

Ports description with reference to the following

registers:

Port C data register, Address C2h (Read/Write).

- BIT D0 “SCL”

- BIT D1 “SDA”

- BIT D3 “SEN”

Port C data direction register, Address C6h

(Read/Write).

SSDR

SPI Serial Data Register

(CCh, Read/ Write)

D7 D6 D5 D4 D3 D2 D1 D0

D0-D7 = Data Bits

Figure 40. SPI Serial Data Register

D7-D0. These are the SPI data bits. They can be

neither read nor written when SPI is operating

(BUSY bit set). They are undefined after reset.

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