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8XC196MC, MD, MH USER’S MANUAL
C-66
WG_PROTECT
WG_PROTECT
Address:
Reset State (MC, MD)
Reset State (MH):
1FCEH
F0H
E0H
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 0
8XC196MC, MD
— — —— ES IT DP EO
7 0
8XC196MH
— — —PT ES IT DP EO
Bit
Number
Bit
Mnemonic
Function
7:5 — Reserved; for compatibility with future devices, write zeros to these bits.
6† PT Protection Type
This bit selects the method used for disabling the outputs.
0 = inactive states
1 = weak pull-ups
3:2 ES
IT
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
1 DP Disable Protection
This bit enables and disables the protection circuitry.
0 = enable protection
1 = disable protection
0 EO Enable Outputs
This bit enables and disables the outputs.
0 = disable outputs
1 = enable outputs
†
On the 8XC196MC, MD devices, this bit is reserved. For compatibility with future devices, always
write as zero.