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AN1759 Datasheet(PDF) 17 Page - Freescale Semiconductor, Inc

Part # AN1759
Description  Add a Non-Volatile Clock to the MC68HC705J1A
PDF  24 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

AN1759 Datasheet(HTML) 17 Page - Freescale Semiconductor, Inc

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Application Note
Flowcharts for the Test Interface
AN1759
17
Figure 13. TXD Subroutine
TXD
SET X = 8 AS A COUNTER
LEFT SHIFT ACCA, CARRY = MSB
DECREMENT X
CARRY = 1?
YES
NO
SET SDA = 1
SET SDA = 0
X = 0?, LOOP DONE?
NO
YES
TOGGLE CLOCK
SCL = 1
SCL = 0
MAKE SDA AN INPUT
SCL = 1
SDA PIN = 0?
NO ACK
YES
SLAVE SENT ACK
SCL = 0
MAKE SDA AN OUTPUT
A
A
RETURN FROM SUB
NO ACK ERROR LOOP
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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