MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 269
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MC9S12G
Manufacturer Part Number
MC9S12G
Description
Ignores external trigger. Performs one conversion sequence and stops.
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12G.pdf
(1160 pages)
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Figure 7-9
there is up to a one clock-cycle delay from the host-generated falling edge on BKGD to the start of the bit
time as perceived by the target. The host initiates the bit time but the target finishes it. Since the target
wants the host to receive a logic 0, it drives the BKGD pin low for 13 target clock cycles then briefly drives
it high to speed up the rising edge. The host samples the bit level about 10 target clock cycles after starting
the bit time.
Freescale Semiconductor
Start of Bit Time
Start of Bit Time
Speedup Pulse
Target System
Target System
(Target MCU)
(Target MCU)
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
BDM Clock
BDM Clock
BKGD Pin
BKGD Pin
Perceived
BKGD Pin
BKGD Pin
Drive and
Perceived
Speedup
Drive to
Drive to
Pulse
Host
Host
shows the host receiving a logic 0 from the target. Since the host is asynchronous to the target,
Figure 7-8. BDM Target-to-Host Serial Bit Timing (Logic 1)
Figure 7-9. BDM Target-to-Host Serial Bit Timing (Logic 0)
High-Impedance
MC9S12G Family Reference Manual, Rev.1.01
10 Cycles
10 Cycles
R-C Rise
10 Cycles
10 Cycles
High-Impedance
High-Impedance
Host Samples
Host Samples
BKGD Pin
BKGD Pin
Background Debug Module (S12SBDMV1)
Speedup Pulse
High-Impedance
Next Bit
Earliest
Start of
Next Bit
Earliest
Start of
269
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