HT66F016(2012) View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
Manufacturer
HT66F016 Datasheet PDF : 116 Pages
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HT66F016/HT66F017/HT68F016/HT68F017
· Table Read Program Example
tempreg1 db ? ; temporary register #1
tempreg2 db ? ; temporary register #2
:
:
mov a,06h
; initialise low table pointer - note that this address
mov tblp,a
; is referenced
mov a,07h
; initialise high table pointer
tbhp,a
:
:
tabrd tempreg1
; transfers value in table referenced by table pointer data at program
; memory address ²706H² transferred to tempreg1 and TBLH
dec tblp
; reduce value of table pointer by one
tabrd tempreg2
:
:
org 700h
; transfers value in table referenced by table pointer data at program
; memory address ²705H² transferred to tempreg2 and TBLH in this
; example the data ²1AH² is transferred to tempreg1 and data ²0FH² to
; register tempreg2
; sets initial address of program memory
dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh
:
:
In Circuit Programming
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 us-
ing a 5-pin interface. This provides manufacturers with
the possibility of manufacturing their circuit boards com-
plete with a programmed or un-programmed
microcontroller, and then programming or upgrading the
program at a later stage. This enables product manufac-
turers to easily keep their manufactured products sup-
plied with the latest program releases without removal
and re-insertion of the device.
Holtek
MCU
Pin
Writer Pins Programming Pins Description
ICPMS
PA7
Programming
Mode Select
ICPDA
PA0
Programming
Serial Data
ICPCK
PA2
Programming
Clock
VDD
VDD
Power Supply
VSS
VSS
Ground
Programmer and MCU Pins
The Program Memory can be programmed serially
in-circuit using this 5-wire interface. 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 and one line for the reset. The techni-
cal details regarding the in-circuit programming of the
devices are beyond the scope of this document and will
be supplied in supplementary literature.
During the programming process the ICPMS pin will be
held low by the programmer disabling the normal opera-
tion of the microcontroller and taking control of the PA0
and PA2 I/O pins for data and clock programming pur-
poses. The user must there take care to ensure that no
other outputs are connected to these two pins
Rev. 1.00
20
May 14, 2012
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