MC9S08GB32 Motorola, MC9S08GB32 Datasheet - Page 239
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MC9S08GB32
Manufacturer Part Number
MC9S08GB32
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC9S08GB32.pdf
(290 pages)
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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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