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C-39
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 8
PPW15 PPW14 PPW13 PPW12 PPW11 PPW10 PPW9 PPW8
7 0
PPW7 PPW6 PPW5 PPW4 PPW3 PPW2 PPW1 PPW0
Bit
Number
Bit
Mnemonic
Function
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 F
XTAL1
×
PPW_VALUE for 8XC196MH = 25 F
XTAL1
×
=