M68EVB908GB60E Freescale Semiconductor, M68EVB908GB60E Datasheet - Page 239
![BOARD EVAL FOR MC9S08GB60](/photos/9/23/92369/m68evb908gb60e_sml.jpg)
M68EVB908GB60E
Manufacturer Part Number
M68EVB908GB60E
Description
BOARD EVAL FOR MC9S08GB60
Manufacturer
Freescale Semiconductor
Type
MCUr
Datasheet
1.M68EVB908GB60E.pdf
(290 pages)
Specifications of M68EVB908GB60E
Contents
Module and Misc Hardware
Processor To Be Evaluated
MC9S08GB
Data Bus Width
8 bit
Interface Type
RS-232
Silicon Manufacturer
Freescale
Core Architecture
HCS08
Core Sub-architecture
HCS08
Silicon Core Number
MC9S08
Silicon Family Name
S08GB
Kit Contents
GB60 Evaluation Kit
Rohs Compliant
Yes
For Use With/related Products
MC9S08GB60
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Figure 15-2
The host is asynchronous to the target so there is a 0-to-1 cycle delay from the host-generated falling edge
to where the target perceives the beginning of the bit time. Ten target BDC clock cycles later, the target
senses the bit level on the BKGD pin. Typically, the host actively drives the pseudo-open-drain BKGD pin
during host-to-target transmissions to speed up rising edges. Because the target does not drive the BKGD
pin during the host-to-target transmission period, there is no need to treat the line as an open-drain signal
during this period.
Freescale Semiconductor
SYNCHRONIZATION
PERCEIVED START
(TARGET MCU)
BDC CLOCK
UNCERTAINTY
TRANSMIT 1
TRANSMIT 0
OF BIT TIME
HOST
HOST
shows an external host transmitting a logic 1 or 0 to the BKGD pin of a target HCS08 MCU.
Figure 15-2. BDC Host-to-Target Serial Bit Timing
MC9S08GB/GT Data Sheet, Rev. 2.3
TARGET SENSES BIT LEVEL
10 CYCLES
Background Debug Controller (BDC)
EARLIEST START
OF NEXT BIT
239
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