Rev. 1.10
22
November 04, 2019
Rev. 1.10
23
November 04, 2019
HT45F5Q-3
Battery Charger Flash MCU
HT45F5Q-3
Battery Charger Flash MCU
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.
*
*
Writer_VDD
ICPDA
ICPCK
Writer_VSS
To other Circuit
VDD
PA0
PA2
VSS
Writer Connector
Signals
MCU Programming
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 HT45V5Q-3 which is used to emulate the HT45F5Q-3 device. This 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. 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. When users use the EV chip for debugging, other functions which are
shared with the OCDSDA and OCDSCK pins in the 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 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 EV Chip Pins
Pin Description
OCDSDA
OCDSDA
On-Chip Debug Support Data/Address input/output
OCDSCK
OCDSCK
On-Chip Debug Support Clock input
VDD
VDD
Power Supply
VSS
VSS
Ground
