BH66F2260 Datasheet, PDF (29/214 Pages) Holtek Semiconductor Inc – R-Sensor Blood Pressure Meter Flash MCU

BH66F2260
R-Sensor Blood Pressure Meter Flash MCU
Table Read Program Example
rombank 1 code1
ds .section ‘data’
tempreg1 db? ; temporary register #1
tempreg2 db? ; temporary register #2
code0 .section ‘code’
mov a,06h ; initialise table pointer - note that this address is referenced
mov tblp,a ; to the last page or the page that tbhp pointed
mov a,03fh ; initialise high table pointer
mov tbhp,a ; it is not necessary to set tbhp if executing tabrdl
:
:
tabrd tempreg1 ; transfers value in table referenced by table pointer register pair
; to tempreg1
tabrdl tempreg1 ; data at program memory address "3F06H" transferred to tempreg1
; and TBLH
dec tblp ; reduce value of table pointer by one
tabrd tempreg2 ; transfers value in table referenced by table pointer register pair
; to tempreg2
tabrdl tempreg2 ; data at program memory address "3F05H" transferred to tempreg2
; and TBLH in this example the data "1AH" is transferred to
; tempreg1 and data "0FH" to tempreg2
; the value "00H" will be transferred to the high byte register TBLH
:
:
code1 .section ‘code’
org 1F00h ; sets initial address of last page
dc 00Ah,00Bh,00Ch,00Dh,00Eh,00Fh,01Ah,01Bh
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 4-pin 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.
Holtek Writer Pins
ICPDA
ICPCK
VDD
VSS
MCU Programming Pins
PA0
PA2
VDD
VSS
Pin Description
Programming Serial Data/Address
Programming Clock
Power Supply
Ground
The Program Memory and EEPROM Data Memory can be programmed serially in-circuit using
this 4-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 technical details regarding the in-circuit programming of the device is beyond the scope of this
document and will be supplied in supplementary literature.
During the programming process, the user must take care of the ICPDA and ICPCK pins for data
and clock programming purposes to ensure that no other outputs are connected to these two pins.
Rev. 1.00
29
March 15, 2017