AN87C196KC Просмотр технического описания (PDF) - Intel

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AN87C196KC

16-BIT HIGH-PERFORMANCE CHMOS MICROCONTROLLER

Intel 

AUTOMOTIVE 87C196KC

8-BIT MODE A D CHARACTERISTICS

The 8-bit mode trades off resolution for a faster con-

version time The AD TIME register must be used

when performing an 8-bit conversion

Sample Time

20 States

Convert Time

56 States

A6H in AD TIME

9 8 ms 16 MHz

The following specifications are tested 16 MHz

with OA6H in AD TIME The actual AD TIME reg-

ister is tested with all possible values to ensure

functionality but the accuracy of the A D converter

is not

Parameter

Typical

Minimum

Resolution

256

8

Absolute Error

0

Full Scale Error

g1

Zero Offset Error

g2

Non-Linearity

0

Differential Non-Linearity Error

lb1

Channel-to-Channel Matching

Repeatability

g0 25

Temperature Coefficients

Offset

Full Scale

Differential Non-Linearity

0 003

0 003

0 003

Maximum

256

8

g2

g2

a1

g1

Units

Levels

Bits

LSBs

LSBs

LSBs

LSBs

LSBs

LSBs

LSBs

LSB C

LSB C

LSB C

Notes

NOTES

An ‘‘LSB’’ as used here has a value of approximately 20 mV

1 Typical values are expected for most devices at 25 C

8XC196KB TO 87C196KC DESIGN

CONSIDERATIONS

1 Memory Map The 87C196KC has 512 bytes of

RAM SFRs and 16K of ROM EPROM The extra

256 bytes of RAM will reside in locations 100H –

1FFH and the extra 8K of EPROM will reside in

locations 4000H–5FFFH These locations are

external memory on the 87C196KB

2 The CDE pin on the KB has become a VSS pin on

the KC to support 16 MHz operation

3 EPROM programming The 87C196KC has a dif-

ferent programming algorithm to support 16K of

on-board memory When performing Run-Time

Programming use the section of code on page

99 of the 80C196KC User’s Guide Order Num-

ber 270704

4 ONCE Mode Entry The ONCE mode is entered

on the 87C196KC by driving the TXD pin low on

the rising edge of RESET The TXD pin is held

high by a pullup that is specified at 1 4 mA and

remain at 2 0V This Pullup must not be overrid-

den or the 87C196KC will enter the ONCE mode

5 During the bus HOLD state the 87C196KC weak-

ly holds RD WR ALE BHE and INST in their

inactive states The 87C196KB only holds ALE in

its inactive state

6 A RESET pulse from the 87C196KC is 16 states

rather than 4 states as on the 87C196KB (i e a

watchdog timer overflow) This provides a longer

RESET pulse for other devices in the system

20

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