HT83F40P datasheet(17/61 Pages) HOLTEK

17 / 61 page

HT83FXX

Rev. 1.00

May 12, 2009

WRITE

The

²WRITE² instruction is used to write a page byte of

data into the Flash Data Memory. To instigate a WRITE

instruction, the CS bit should be set low, then the in-

struction code

²02², all transmitted via the SI bit. For this

device, The address information should then follow with

the MSB bit being transmitted first. After the last address

bit, A0, has been transmitted, the data can be immedi-

ately transmitted MSB first. After all the WRITE instruc-

tion code, address and data have been transmitted, the

data will be written into the Flash Data Memory when the

CS bit is set to high. The Flash Data Memory does this

by executing an internal write-cycle, which will first

erase and then write the previously transmitted data

byte into the Flash Data Memory. This process takes

place internally using the Flash Data Memory

¢s own in-

ternal clock and does not require any action from the

SCK clock. No further instructions can be accepted by

the Flash Data Memory until this internal write-cycle has

finished.

ERAL

The

²ERAL² instruction is used to erase the whole con-

tents of the Flash Data Memory. After it has been exe-

cuted all the data in the Flash Data Memory will be set to

²1². To instigate this instruction, the CSB bit should be

set low. The instruction code

²20². Following on from

this, a

²20² should then be transmitted. After the ²ERAL²

instruction code has been transmitted, the Flash Data

Memory data will be erased when the CS bit is set to

high.

The Flash Data Memory does this by executing an inter-

nal write-cycle. This process takes place internally using

the Flash Data Memory

¢s own internal clock and does

not require any action from the SCK clock. No further in-

structions can be accepted by the Flash Data Memory

until this internal write-cycle has finished. To determine

when the write

Instruction

Function

Instruction Code

Address

Data

READ

Read Out Data

A23~A0

D7~D0

WRITE

Write Data Page Byte

A23~A0

D7~D0

ERAL

Erase All

A23~A0

Instruction Set Summary

In Circuit Programming

The provision of Flash type Data Memory gives the user

and designer the convenience of easy upgrades and

modifications to their Data on the same device. As an

additional convenience, Holtek has provided a means of

programming the microcontroller in-circuit. This pro-

vides manufacturers with the possibility of manufactur-

ing their circuit boards complete with a programmed or

un-programmed microcontroller, and then programming

or upgrading the program at a later stage. This enables

product manufacturers to easily keep their manufac-

tured products supplied with the latest data releases

without removal and re-insertion of the device.

Pin Name

Function

Serial data input

Serial data output

SCK

Serial clock

Signal Select

VDD

Power supply

VSS

Ground

The Data Memory can be programmed serially in-circuit

using a 8-wire interface. Data is downloaded and up-

loaded serially on two SI/SO pins with an additional line

for the clock. Two additional lines are required for the

power supply and one line for the select signal. The

technical details regarding the in-circuit programming of

the devices are beyond the scope of this document and

will be supplied in supplementary literature.

D a t a I n

C l o c k

E r r o P r o o f

S i g n a l S e l e c t

D a t a O u t

P o w e r

G r o u n d

R e s e t

S O

C L K

N C

C S

S I

V D D

V S S

R e s e t

C o n n e c t o r

In-circuit Programming Interface

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