On-Chip Debug Support - Ocds - Holtek BS83A04C Manual

4-key enhanced touch i/o flash mcu
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BS83A04C
4-Key Enhanced Touch I/O Flash MCU
Holtek Writer Pins
ICPDA
ICPCK
VDD
VSS
The Program 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. 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.
Note: * may be resistor or capacitor. The resistance of * must be greater than 1kΩ or the capacitance
of * must be less than 1nF.
On-Chip Debug Support – OCDS
There is an EV chip named BS83AV04C which is used to emulate the BS83A04C device. The EV
chip device also provides an "On-Chip Debug" function to debug the real MCU device during the
development process. The EV chip and the real MCU device are almost functionally compatible
except for "On-Chip Debug" function and package type. Users can use the EV chip device to
emulate the real chip device behavior by connecting the OCDSDA and OCDSCK pins to the Holtek
HT-IDE development tools. The OCDSDA pin is the OCDS Data/Address input/output pin while
the OCDSCK pin is the OCDS clock input pin. For more detailed OCDS information, refer to the
corresponding document named "Holtek e-Link for 8-bit MCU OCDS User's Guide".
Holtek e-Link Pins
OCDSDA
OCDSCK
VDD
VSS
Rev. 1.00
MCU Programming Pins
PA0
PA2
VDD
VSS
Writer Connector
Signals
Writer_VDD
ICPDA
ICPCK
Writer_VSS
*
*
To other Circuit
EV Chip OCDS Pins
OCDSDA
On-Chip Debug Support Data/Address input/output
OCDSCK
On-Chip Debug Support Clock input
VDD
Power Supply
VSS
Ground
19
Pin Description
Programming Serial Data/Address
Programming Clock
Power Supply
Ground
MCU Programming
Pins
VDD
PA0
PA2
VSS
Pin Description
March 24, 2020

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