XE8807AMI026TLF Semtech, XE8807AMI026TLF Datasheet - Page 121

• Manufacturer Part Number: XE8807AMI026TLF
• Description: IC MCU LOW PWR MTP FLASH 32-TQFP
• Manufacturer: Semtech

Specifications of XE8807AMI026TLF

• Applications: Sensing Machine
• Core Processor: RISC
• Program Memory Type: FLASH (11 kB)
• Controller Series: XE8000
• Ram Size: 512 x 8
• Interface: UART, USRT
• Number Of I /o: 24
• Voltage - Supply: 2.4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP, 32-VQFP
• For Use With: XE8000MP - PROG BOARD AND PROSTART2 CARD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: XE8807AMI026TR

When UsrtEnWaitCond1 is 1, the S0 signal will be stretched in its low state after its falling edge if the condition 1
has been detected before (UsrtCond1=1). UsrtWaitS0 is then set to 1, indicating that the S0 line is forced low.
One can release S0 by writing to the RegUsrtBufferS1 register.
Figure 16-5 shows the sampling function implemented by the UsrtBufferS1 bit. The bit UsrtBufferS1 in
RegUsrtBufferS1 is the value of S1 sampled on PB[4] at the last rising edge of S0. The bit UsrtEdgeS0 in
RegUsrtEdgeS0 is set to one on the same S0 rising edge and is cleared by a read operation of the
RegUsrtBufferS1 register. The bit therefor indicates that a new value is present in the RegUsrtBufferS1 which
was not yet read.
© Semtech 2006
S1
S0
UsrtWaitS0
write Reg UsrtBufferS1
S1
S0
UsrtBufferS1
read Reg UsrtBufferS1
UsrtEdgeS0
Figure 16-4: Conditional stretching (UsrtEnWaitCond1=1)
Figure 16-5: S1 sampling
16-6
XE8806A/XE8807A
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