參數(shù)資料
型號(hào)： MC68HC705V8B
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封裝： SDIP-56
文件頁數(shù)： 101/172頁
文件大小： 890K
代理商： MC68HC705V8B
SECTION 3: EPROM AND EEPROM
MOTOROLA
Page 23
MC68HC705V8 Specification Rev. 2.1
SECTION 3
EPROM AND EEPROM
The MC68HC705V8 contains EPROM and EEPROM Memory. This section describes the
programming mechanisms for each type of memory.
3.1
EPROM BOOTLOADER
Bootloader Programming Mode is entered upon the rising edge of RESET if the IRQ pin is
at VTST and the PB7 pin is at logic one. The Bootloader code resides in the ROM from
$3C00 to $3FEF. This program handles copying of user code from an external EPROM into
the on-chip EPROM.
The user code must be a one-to-one correspondence with the internal EPROM addresses.
3.1.1
BOOTLOADER FUNCTIONS
Three pins are used to select various bootloader functions. These pins are PC2, PC1 and
PC0. PC3 and PC4 are tied to logic zero. Two other pins, PC7 and PC6 are used to drive
the PROG LED and the VERF LED respectively. The programming modes are shown in
Table 3-1.
Table 3-1:
Bootloader Functions
3.2
EPROM PROGRAMMING
The EPROM array is programmed through manipulation of the Programming Register
located at $000D. It maybe programmed in user, bootstrap or test mode. The schematic of
the EPROM programmer using the bootstrap firmware is shown in Figure 3-1. In addition
to the main EPROM array, the Mask Option Register must also be programmed
appropriately by the programming software.
PC2
PC1
PC0
MODE
0
Program/Verify EPROM
0
1
Verify Only
0
1
0
Factory use
0
1
Jump to top of EEPROM
1
0
Jump to top of RAM
1
0
1
Jump to top of EPROM
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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