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參數資料
型號: MC68B912B32FU8
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 16-Bit Microcontroller
中文描述: 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數: 117/128頁
文件大小: 748K
代理商: MC68B912B32FU8
MC68HC912B32
MC68HC912B32TS/D
MOTOROLA
117
Figure 27 BDM Host to Target Serial Bit Timing
Figure 28 BDM Target to Host Serial Bit Timing (Logic 1)
Figure 28
shows the host receiving a logic one from the target MC68HC912B32 MCU. Since the host
is asynchronous to the target MCU, there is a 0-to-1 cycle delay from the host-generated falling edge
on BKGD to the perceived start of the bit time in the target MCU. The host holds the BKGD pin low long
enough for the target to recognize it (at least two target E cycles). The host must release the low drive
before the target MCU drives a brief active-high speed-up pulse seven cycles after the perceived start
of the bit time. The host should sample the bit level about ten cycles after it started the bit time.
9 CYCLES
E CLOCK
(TARGET MCU)
HOST
TRANSMIT 1
TARGET SENSES BIT
EARLIEST
START OF
NEXT BIT
SYNCHRONIZATION
UNCERTAINTY
PERCEIVED
START
OF BIT TIME
HOST
TRANSMIT 0
HC12A4 BDM HOST TO TARGET TIM
10 CYCLES
E CLOCK
(TARGET
MCU)
EARLIEST
START OF
NEXT BIT
BKGD PIN
PERCEIVED
START OF BIT
TIME
10 CYCLES
HOST SAMPLES
BKGD PIN
HOST
DRIVE TO
BKGD PIN
TARGET MCU
SPEEDUP PULSE
R-C RISE
HIGH-IMPEDANCE
HIGH-IMPEDANCE
HIGH-IMPEDANCE
HC12A4 BDM TARGET TO HOST TIM 1
相關PDF資料
PDF描述
MC68C912B32CFU8 16-Bit Microcontroller
MC68CK338 Highly Integrated, Low-Power, 32-Bit Microcontroller
MC68EC060 32-Bit Microprocessors.(32位微處理器)
MC68EN360RC25V QUad Integrated Communications Controller Users Manual
MC68EN360CFE25 QUad Integrated Communications Controller Users Manual
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