Intel 8XC196MC User Manual page 543

8XC196MC, MD, MH USER'S MANUAL
WG_PROTECT
WG_PROTECT
The waveform protection (WG_PROTECT) register enables and disables the outputs and the
protection circuitry. It also selects either level-sensitive or edge-triggered EXTINT interrupts, and
selects which level or edge will generate an EXTINT interrupt request.
7
8XC196MC, MD —
7
8XC196MH —
Bit Bit
Number Mnemonic
7:5 —
6† PT
3:2 ES
IT
1 DP
0 EO
†
On the 8XC196MC, MD devices, this bit is reserved. For compatibility with future devices, always
write as zero.
C-66
— — —
— — PT
Reserved; for compatibility with future devices, write zeros to these bits.
Protection Type
This bit selects the method used for disabling the outputs.
0 = inactive states
1 = weak pull-ups
Enable Sampling and Interrupt Type
The ES bit selects whether the protection circuitry samples the EXTINT
signal level or detects a signal transition (edge), while the IT bit controls
which value of the edge or level triggers an interrupt request. The
possible combinations are as follows.
ES IT Event
0 0 falling edge
0 1 rising edge
1 0 low level
1 1 high level
Disable Protection
This bit enables and disables the protection circuitry.
0 = enable protection
1 = disable protection
Enable Outputs
This bit enables and disables the outputs.
0 = disable outputs
1 = enable outputs
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Address:
Reset State (MC, MD)
Reset State (MH):
ES IT DP
ES IT DP
Function
1FCEH
F0H
E0H
0
EO
0
EO