REGISTERS

PPW

PPW

no direct access

The programming pulse width (PPW) register is loaded from the external EPROM (locations 14H and 15H for the 8XC196MC and MD; locations 4014H and 4015H for the 8XC196MH) in auto programming mode. The PPW_VALUE determines the programming pulse width.

15

PPW15

PPW14

PPW13

PPW12

7

 

 

 

 

 

 

 

PPW7

PPW6

PPW5

PPW4

 

 

 

 

8

PPW11

PPW10

PPW9

PPW8

 

 

 

0

 

 

 

 

PPW3

PPW2

PPW1

PPW0

 

 

 

 

Bit

Bit

Function

Number

Mnemonic

 

 

 

 

15:0

PPW15:0 PPW_VALUE

 

This value establishes the programming pulse width for auto programming. Use the appropriate formula to calculate the PPW_VALUE, then write the result to the PPW register.

PPW_VALUE for 8XC196MC, MD = 62.5 × FXTAL1

PPW_VALUE for 8XC196MH

= 25 × FXTAL1

C-39

Page 516
Image 516
Intel 8XC196MD, 8XC196MH, 8XC196MC manual PPW150 Ppwvalue