CXP971000 查看數據表（PDF） - Sony Semiconductor

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CXP971000

CMOS 16-bit Single Chip Microcomputer

Sony Semiconductor 

CXP971000

Switching of Piggyback Mode and Evaluator Mode

Piggyback mode can be used by setting two LCC-type EPROM (for upper bytes, for lower byte) and connecting

to the connector of top of the chip.

Evaluator mode can be used by connecting in-circuit emulator CPU probe to the connector of top of the chip.

Piggyback mode

Pin 1 marking

For lower bytes For upper bytes

LCC-type PROM

Evaluator mode

0

1

EPROM adaptor

Chip

CPU probe

Chip

Notes on PK6 Usage

FLASH EEPROM incorporated PK6 is also used as flash mode setting function. Note the followings:

1. "H" is output to PK6 during a reset. That is driven at comparatively high impedance (approximately 150kΩ),

and take care that VOH should not fall under 0.7VDD by the partial pressure with external circuit load

impedance.

2. When using software reset functions, PK6 may not rise enough during a reset. Switching PK6 to "H" output

prior to software reset execution or connecting pull-up resistor is recommended.

RST

Normal operation

PK6

Keep PK6 above 0.7 VDD during

this period.

Flash mode

Mask ROM and piggy/evaluation chip do not have flash mode setting function. Considering that EEPROM

incorporated type is used, above countermeasure should be performed.

–7–

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