XE8805 SEMTECH [Semtech Corporation], XE8805 Datasheet - Page 61

• Manufacturer Part Number: XE8805
• Description: Data Acquisition MCU
• Manufacturer: SEMTECH [Semtech Corporation]

11.1 Features
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11.2 Overview
Port A is a general purpose 8 bit wide digital input port, with interrupt capability. Figure 11-1 shows its structure.
© Semtech 2006
Input port, 8 bits wide
Each bit can be set individually for debounced or direct input
Each bit can be set individually for pull-up or not
Each bit is an interrupt request source on the rising or falling edge
A system reset can be generated on an input pattern
PA[0] and PA[1] can generate two events for the CPU, individually maskable
PA[0] to PA[3] can be used as clock inputs for the counters/timers/PWM (product dependent)
PA[0] can be used to enable the RC oscillator
VBat
8
8
1
0
8x
debounce
1
Port A
11
10
01
00
Figure 11-1:structure of Port A
0
8x
DebFast
(RegSysMisc(2))
PAReset[x]
0
1
11-2
8
8
1
0
8x
8
8
8
8
RegPADebounce
RegPAPullup
RegPAEdge
RegPARes1
RegPARes0
RegPACtrl
RegPAIn
resetfromporta
RC
interrupts
events
cntclocks
256 Hz
8 kHz
XE8805/05A
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