Rev. 1.00
14
March 24, 2020
Rev. 1.00
15
March 24, 2020
BS83A04C
4-Key Enhanced Touch I/O Flash MCU
BS83A04C
4-Key Enhanced Touch I/O Flash MCU
LVR Electrical Characteristics
Ta=25°C
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
V
LVR
Low Voltage Reset Voltage
— LVR enable, voltage is 1.7V -5%
1.7
+5%
V
I
LVRBG
Operating current
3V
LVR enable, V
LVR
=1.7V
—
—
15
μA
5V
—
15
25
t
LVR
Minimum Low Voltage Width to Reset
—
—
120
240
480
μs
Power-on Reset Characteristics
Ta=25°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
POR
V
DD
Start Voltage to Ensure Power-on Reset
—
—
—
—
100
mV
RR
POR
V
DD
Rising Rate to Ensure Power-on Reset
—
—
0.035
—
—
V/ms
t
POR
Minimum Time for V
DD
Stays at V
POR
to Ensure
Power-on Reset
—
—
1
—
—
ms
V
DD
t
POR
RR
POR
V
POR
Time
System Architecture
A key factor in the high-performance features of the Holtek range of microcontrollers is attributed
to their internal system architecture. The device takes advantage of the usual features found within
RISC microcontrollers providing increased speed of operation and Periodic performance. The
pipelining scheme is implemented in such a way that instruction fetching and instruction execution
are overlapped, hence instructions are effectively executed in one cycle, with the exception of branch
or call instructions. An 8-bit wide ALU is used in practically all instruction set operations, which
carries out arithmetic operations, logic operations, rotation, increment, decrement, branch decisions,
etc. The internal data path is simplified by moving data through the Accumulator and the ALU.
Certain internal registers are implemented in the Data Memory and can be directly or indirectly
addressed. The simple addressing methods of these registers along with additional architectural
features ensure that a minimum of external components is required to provide a functional I/O
control system with maximum reliability and flexibility. This makes the device suitable for low-cost,
high-volume production for controller applications.
Clocking and Pipelining
The main system clock, derived from either an HIRC or LIRC oscillator is subdivided into four
internally generated non-overlapping clocks, T1~T4. The Program Counter is incremented at the
beginning of the T1 clock during which time a new instruction is fetched. The remaining T2~T4
clocks carry out the decoding and execution functions. In this way, one T1~T4 clock cycle forms