PCF8833USLASH2DA datasheet(60/112 Pages) PHILIPS

60 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

6.2.46

READBACK

The PCF8833 can be identified when the readback

commands (RDID1, RDID2 and RDID3) are sent via the

interface. When the readback command is sent, the

PCF8833 will send back an 8-bit number.

Depending on the SCLK speed the readback bit D7 might

get corrupted. When the speed is reduced to at least half

of the specified maximum speed, at least for the D7 bit, the

transferred bit is valid.

ID1 is the manufacture ID and is hardwired in the

PCF8833.

ID2 is the version ID and is programmed in the module

maker OTP cells; see Chapter 15.

ID3 is the module ID and is programmed in the module

maker OTP cells; see Chapter 15.

Table 76 RDID1 data format

Table 77 RDID2 data format; note 1

Note

1. X = don’t care.

Table 78 RDID3 data format; note 1

Note

1. X = don’t care.

6.2.47

ENABLE OR DISABLE FACTORY DEFAULTS (SFD)

The Enable or disable factory defaults (SFD) command will enable or disable the factory defaults stored in the MMOTP

cells; see Section 15.2. These factory defaults can be set by the module maker. If the OTP bit EFD (enable factory

defaults) has been set, these values can not be changed via the interface and the SFD command will have no effect.

Otherwise, the data specified by commands will only be used if SFD is set to logic 0.

The reset state of the SFD is defined in Table 80.

Table 79 Enable/disable factory defaults register bits

SYMBOL

D/C

6543210

DEFAULT

(S)DIN

DAH

(S)DOUT

−

01000101

45H

SYMBOL

D/C

6543210

DEFAULT

(S)DIN

DBH

(S)DOUT

−

XXXXXXXX

80H

SYMBOL

D/C

6543210

DEFAULT

(S)DIN

DCH

(S)DOUT

−

XXXXXXXX

03H

D/C

76543210

DEFAULT

01110111

SFD

EFH

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