HC705V8GRSSLASHD datasheet(34/172 Pages) NXP

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SECTION 3: EPROM AND EEPROM

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

Program/Verify EPROM

Verify Only

Factory use

Jump to top of EEPROM

Jump to top of RAM

Jump to top of EPROM

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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