HT85F2270 datasheet(32/226 Pages) HOLTEK

32 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

In-Circuit Programming – ICP

The provision of Flash type Program Memory provides the user with a means of convenient

and easy upgrades and modifications to their programs on the same device. As an additional

convenience, Holtek has provided a means of programming the microcontroller in-circuit using

a four-line serial interface. This provides manufacturers with the possibility of manufacturing

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 manufactured products supplied with the latest program releases without removal

and re-insertion of the device.

The Holtek Flash MCU to Writer Programming Pin correspondence table is as follows:

Holtek Writer Pins

MCU Programming Pins

Function

ICPDA

P0.0/ICPDA

Programming Serial Data/Address

ICPCK

RESET/ICPCK

Programming Serial Clock

VDD

Power Suppl�

VSS

Ground

The Program Memory can be programmed serially in-circuit using the interface on pins ICPDA

and ICPCK. Data is downloaded and uploaded serially on a single pin with an additional line for the

clock. Two additional lines are required for the power supply. The technical details regarding the

in-circuit programming of the device are beyond the scope of this document and will be supplied in

supplementary literature. The Flash Program Memory Read/Write function is implemented using a

series of registers.

On-Chip Debug Support – OCDS

An EV chip, HT85V2280, is provided which includes all the HT85F2280 functions as well as an

“On-Chip Debug” interface for emulation of the HT85F2280/2270/2260 devices. To minimise

the difference between the real IC (the volume-production version) and the EV chip (the device

with the debug interface), a protocol converter is implemented to translate the external 2-wire

connections (TCK and TDA) into 4 internal JTAG signals (TCK, TMS, TDI, and TDO) and vice

versa. Users can use the EV chip device to emulate the real chip device behavior by connecting

the TDA and TCK pins to the related Holtek development tools. The TDA pin is the OCDS

Data/Address input/output pin while the TCK pin is the OCDS clock input pin. When users use the

EV chip for debugging, other functions which are shared with the TDA and TCK pins in the actual

MCU device will have no effect in the EV chip. However, the two OCDS pins which are pin-shared

with the ICP programming pins are still used as the Flash Memory programming pins for ICP. For

a more detailed OCDS description, refer to the corresponding user’s guide.

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