LFEBS12UB Freescale Semiconductor, LFEBS12UB Datasheet - Page 296

KIT STUDENT LEARNING S12 DG128

LFEBS12UB

Manufacturer Part Number
LFEBS12UB
Description
KIT STUDENT LEARNING S12 DG128
Manufacturer
Freescale Semiconductor
Datasheets

Specifications of LFEBS12UB

Architecture
8/16-bit
Code Gen Tools Included
Code Warrior
Silicon Manufacturer
Freescale
Core Architecture
S12
Core Sub-architecture
S12
Silicon Core Number
MC9S12
Silicon Family Name
S12D
Kit Contents
HCS12 DG128 Learning Kit
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Chapter 7 Background Debug Module (S12XBDMV2)
earlier. Synchronization between the host and target is established in this manner at the start of every bit
time.
Figure 7-8
target system. The host is asynchronous to the target, so there is up to a one clock-cycle delay from the
host-generated falling edge to where the target recognizes this edge as the beginning of the bit time. Ten
target clock cycles later, the target senses the bit level on the BKGD pin. Internal glitch detect logic
requires the pin be driven high no later that eight target clock cycles after the falling edge for a logic 1
transmission.
Since the host drives the high speedup pulses in these two cases, the rising edges look like digitally driven
signals.
The receive cases are more complicated.
system. Since the host is asynchronous to the target, there is up to one clock-cycle delay from the host-
generated falling edge on BKGD to the perceived start of the bit time in the target. The host holds the
BKGD pin low long enough for the target to recognize it (at least two target clock cycles). The host must
release the low drive before the target drives a brief high speedup pulse seven target clock cycles after the
perceived start of the bit time. The host should sample the bit level about 10 target clock cycles after it
started the bit time.
296
Because of an order from the United States International Trade Commission, BGA-packaged product lines and partnumbers
Start of Bit Time
indicated here currently are not available from Freescale for import or sale in the United States prior to September 2010
(Target MCU)
BDM Clock
Transmit 1
Transmit 0
Perceived
shows an external host transmitting a logic 1 and transmitting a logic 0 to the BKGD pin of a
Host
Host
Synchronization
Uncertainty
Figure 7-8. BDM Host-to-Target Serial Bit Timing
MC9S12XE-Family Reference Manual , Rev. 1.23
Figure 7-9
10 Cycles
shows the host receiving a logic 1 from the target
Target Senses Bit
Freescale Semiconductor
Next Bit
Earliest
Start of

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