EM78P568 datasheet(4/61 Pages) EMC

4 / 61 page

User Application Note

(Before using this chip, take a look at the following description note, it includes important messages.)

1. There are some undefined bits in the registers. The values in these bits are unpredicted. These

bits are not allowed to use. We use the symbol “-” in the spec to recognize them.

2. You will see some names for the register bits definitions. Some name will be appear very

frequently in the whole spec. The following describes the meaning for the register’s definitions

such as bit type, bit name, bit number and so on.

765

RAB7

RAB6

BAB5

RAB4

RAB2

RAB0

R/W -0

R-1

R/W -1

R/W

Bit type

Bit name

Bit number

read/write

(default value=0)

read/write

(default value=1)

read only

(w/o default value)

read/write

(w/o default value)

PAGE0

RAB1

(undefined) not allowed to use

R-0

read only

(default value=0)

read only

(default value=1)

3. Let “IOCE PAGE0 Bit 4 ~ Bit 7” remain these values to “0”othwise it will generate unpredicted

interrupts.

4. Let “IOCC PAGE1 Bit 0” remain its value to “0” unchanged otherwise Comparator and CTCSS

function will fail.

5. Let IOC6 PAGE1 bit 0 ~ Bit 1 remain these values to “0” unchanged if PORT60,61 are used.

6. Please set RA PAGE2 bit 7 to “1” to get better LCD display performance while LCD driver is

used.

7. The difference between EM78568 and EM78P568.

Function

Item

EM78568

EM78P568

Data RAM

0.5k x 8

1k x 8

I/O

PC0

PC0 ~ PC7

PB0 ~ PB7

LCD driver

SEG0 ~ SEG19

SEG0 ~ SEG31

Package

100-pin QFP,63-pin die

100-Pin QPF, 78-pin die

DC characteristic

Parameter

Symbol

Condition

Min Typ Max Unit

Internal 2.5V ref.. 2.5VREF VDD=5V, 25 deg for EM78568

2.32 2.46 2.58

Voltage

VDD=5V, 25 deg for EM78P568 2.14 2.32 2.44

VDD=3V, 25 deg for EM78568

2.22 2.36 2.48

VDD=3V, 25 deg for EM78P568 2.04 2.25 2.36

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