68HC705BD7 datasheet(40/85 Pages) FREESCALE

40 / 85 page

SECTION 6: OPERATING MODES

Page 30

GENERAL RELEASE SPECIFICATION

MC68HC05BD7 Rev. 2.0

Table 6-1: Mode Select Summary

Figure 6-1: Mode Entry Diagram

6.5

EPROM Programming

The 11.5K bytes of USER EPROM is positioned at $1000 through $3DFF with the vector

space from $3FF0 to $3FFF. The erased state of EPROM is read as $FF and EPROM

power is supplied from VPP and VDD pins.

The Programming Control Register (PCR) is provided for the EPROM programming. The

function of EPROM depends on the device operating mode.

In the User Mode, ELAT and PGM bits in the PCR are available for the user read/write and

the remaining test bits become read only bits.

Please contact Motorola for Programming boards availability.

6.5.1

Programming Sequence

The EPROM programming is as follows:

- Set the ELAT bit

- Write the data to the address to be programmed

- Set the PGM bit

- Delay for the appropriate amount of time

- Clear the PGM and the ELAT bit

The last item may be done on a single CPU write. It is important to remember that an

external programming voltage must be applied to the VPP pin while programming, but it

should remain between VDD and VSS during normal operation.

MODE

RESET

IRQ

PB5

USER MODE

SELF CHECK/BOOTSTRAP

L or H

VTST

VTST = 1.8 x VDD

H = VDD

L = VSS

VTST

RESET

IRQ

PB5

Single

Chip Mode

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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