MC9S08GB32 Motorola, MC9S08GB32 Datasheet - Page 241

• Manufacturer Part Number: MC9S08GB32
• Description: Microcontrollers
• Manufacturer: Motorola

Figure 15-4
asynchronous to the target MCU, there is a 0-to-1 cycle delay from the host-generated falling edge on
BKGD to the start of the bit time as perceived by the target MCU. The host initiates the bit time but the
target HCS08 finishes it. Because the target wants the host to receive a logic 0, it drives the BKGD pin low
for 13 BDC clock cycles, then briefly drives it high to speed up the rising edge. The host samples the bit
level about 10 cycles after starting the bit time.
Freescale Semiconductor
SPEED-UP PULSE
PERCEIVED START
TO BKGD PIN
TARGET MCU
(TARGET MCU)
HOST DRIVE
DRIVE AND
BDC CLOCK
OF BIT TIME
BKGD PIN
shows the host receiving a logic 0 from the target HCS08 MCU. Because the host is
Figure 15-4. BDM Target-to-Host Serial Bit Timing (Logic 0)
MC9S08GB/GT Data Sheet, Rev. 2.3
10 CYCLES
HOST SAMPLES BKGD PIN
10 CYCLES
HIGH-IMPEDANCE
SPEEDUP
PULSE
Background Debug Controller (BDC)
EARLIEST START
OF NEXT BIT
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