参数资料
型号: XC68HC705X4DW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 68/168页
文件大小: 656K
代理商: XC68HC705X4DW
Modes of Operation and Pin Descriptions
MC68HC05X4 Rev 1.0
16
Modes of Operation and Pin Descriptions
MOTOROLA
Bootloader data
format
Serial data byte format is 8 data bits, no parity, one stop bit. The baud
rate for both transmission and reception will be 9600 for a bus frequency
(f
OP) of 2MHz.
Serial data packet format is:
(count) (byte 0) (byte 1) . . . (byte (count – 2))
Program execution will automatically commence after the last byte is
received.
Port A pins are used as follows:
PA0
Serial receive data (RXD) – 9600 baud at fOP = 2MHz
PA1
Serial transmit data (TXD) – 9600 baud at fOP = 2MHz
PA2
‘High’
Program enters load/execute mode.
‘Low’
Bootloader program runs a simple test routine which
outputs the contents of the user ROM to port B one byte at a time.
PA3
(This bit is read only if PA2 is ‘High’.)
‘High’
Load – bootloader routine waits for a serial byte. The
first byte received is the total byte count (COUNT) for the message. The
serial bytes received are loaded, starting at RAMST + 1. When all the
bytes have been downloaded the program will automatically begin
executing from RAMST + 1. The program will sit in a Wait loop
indefinitely if fewer than ‘COUNT’ bytes are received.
‘Low’
Execute – The program passes control to RAMST +1.
This can be used to allow Port A to be tested (using a user generated
routine) as follows:
Download program into RAM with PA3 = ‘High’, but
ensuring that ‘COUNT’ is greater than the number of bytes to be
transferred. Now, while the MCU is waiting for further bytes to arrive, apply
a reset signal. Whilst holding RESET low, connect port A as required for
testing, then release RESET. The test program in RAM will now test port A.
PA4
‘High’
This indicates normal operation.
‘Low’
This bit is cleared if an overrun error occurs. The device
should be reset if this happens.
4-modes
相关PDF资料
PDF描述
XC7455ARX1000LF 32-BIT, 1000 MHz, RISC PROCESSOR, CBGA483
XC7455ARX867LF 32-BIT, 867 MHz, RISC PROCESSOR, CBGA483
XC4013E-1HQG240C FPGA, 576 CLBS, 10000 GATES, 166 MHz, PQFP240
XC4013E-2HQG240C FPGA, 576 CLBS, 10000 GATES, 125 MHz, PQFP240
XC4013E-2HQG240I FPGA, 576 CLBS, 10000 GATES, 125 MHz, PQFP240
相关代理商/技术参数
参数描述
XC68HC711D3CFS3 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
XC68HC711E9CFS2 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
XC68HC711E9CFS3 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller
XC68HC711G5CFN 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述:
XC68HC711G5FN 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller