Datasheet > HE84G770(S)

HE84G770(S)

更新时间： 2022-01-18 18:38:00

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HE84G770(S) 数据手册

King Billion Electronics Co., Ltd

HE84G770

駿億電子股份有限公司

HE80004H SERIES

5.ROM Map Configurations

The chip has built-in 1M bytes internal ROM including 512K bytes program ROM and 512K bytes data

ROM. In addition, address and data buses are provided to access External ROM. The MCU can access up

to 4 MB Program ROM and up to 16 MB Data space through external buses. The SEG[79..72],

SEG[71..44] pads are used as either data and address buses for external ROM or LCD segment driver

pads depending on the mask option MO_EXMEM. When the external ROM mask option is selected, the

MCU will retrieve the instructions and data from external ROM through the address and data buses and

the SEG[79..44] will not be LCD segment signals.

The bit 14 ~ 15 bit of 16-bit logical program address can be mapped to any one of 256 pages through

mapping registers PSA1, PSA2, PSA3. As logical page 0 can not be moved and is always physical page 0,

the PSA1 ~ PSA3 contain the physical page addresses of logical pages 1 ~ 3.

Logical Address

A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0

Page Addr. A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0

A[15..14] Logical Page Physical Page Address Physical Address

00 A[13..0]

PSA1

PSA2

PSA3

PSA1+A[13..0]

PSA2+A[13..0]

PSA3+A[13..0]

Bits Definition

Reset

0x01

0x02

0x03

PSA1

PSA2

PSA3

0x2C

0x2D

0x2E

R/W

A21

A20

A19

A18

A17

A16

A15

A14

A18

October 31, 2003

Version:V1.1

This specification is subject to change without notice. Please contact sales person for the latest version before use.

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