IC MCU 8BIT OTP 4K 20 PDIP

ST62T20CB6

Manufacturer Part NumberST62T20CB6
DescriptionIC MCU 8BIT OTP 4K 20 PDIP
ManufacturerSTMicroelectronics
SeriesST6
ST62T20CB6 datasheet
 


Specifications of ST62T20CB6

Core ProcessorST6Core Size8-Bit
Speed8MHzPeripheralsLVD, POR, WDT
Number Of I /o12Program Memory Size4KB (4K x 8)
Program Memory TypeOTPRam Size64 x 8
Voltage - Supply (vcc/vdd)3 V ~ 6 VData ConvertersA/D 8x8b
Oscillator TypeInternalOperating Temperature-40°C ~ 85°C
Package / Case20-DIP (0.300", 7.62mm)Controller Family/seriesST6
No. Of I/o's12Ram Memory Size64Byte
Cpu Speed8MHzNo. Of Timers1
Rohs CompliantYesProcessor SeriesST62T2x
CoreST6Data Bus Width8 bit
Data Ram Size64 BMaximum Clock Frequency8 MHz
Number Of Programmable I/os12Number Of Timers2
Operating Supply Voltage3 V to 6 VMaximum Operating Temperature+ 85 C
Mounting StyleThrough HoleDevelopment Tools By SupplierST622XC-KIT/110, ST62GP-EMU2, ST62E2XC-EPB/110, ST62E6XC-EPB/US, STREALIZER-II
Minimum Operating Temperature- 40 COn-chip Adc8 bit
Lead Free Status / RoHS StatusLead free / RoHS CompliantEeprom Size-
Connectivity-Other names497-2098-5
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Page 18/104

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ST6208C/ST6209C/ST6210C/ST6220C
CPU REGISTERS (Cont’d)
The 12-bit length allows the direct addressing of
4096 bytes in Program Space.
However, if the program space contains more than
4096 bytes, the additional memory in program
space can be addressed by using the Program
ROM Page register.
The PC value is incremented after reading the ad-
dress of the current instruction. To execute relative
jumps, the PC and the offset are shifted through
the ALU, where they are added; the result is then
shifted back into the PC. The program counter can
be changed in the following ways:
– JP (Jump) instruction
PC = Jump address
– CALL instruction
PC = Call address
– Relative Branch InstructionPC = PC +/- offset
– Interrupt
PC = Interrupt vector
– Reset
PC = Reset vector
– RET & RETI instructions PC = Pop (stack)
– Normal instruction
PC = PC + 1
Flags (C, Z). The ST6 CPU includes three pairs of
flags (Carry and Zero), each pair being associated
with one of the three normal modes of operation:
Normal mode, Interrupt mode and Non Maskable
Interrupt mode. Each pair consists of a CARRY
flag and a ZERO flag. One pair (CN, ZN) is used
during Normal operation, another pair is used dur-
ing Interrupt mode (CI, ZI), and a third pair is used
in the Non Maskable Interrupt mode (CNMI, ZN-
MI).
The ST6 CPU uses the pair of flags associated
with the current mode: as soon as an interrupt (or
a Non Maskable Interrupt) is generated, the ST6
CPU uses the Interrupt flags (or the NMI flags) in-
stead of the Normal flags. When the RETI instruc-
tion is executed, the previously used set of flags is
restored. It should be noted that each flag set can
only be addressed in its own context (Non Maska-
ble Interrupt, Normal Interrupt or Main routine).
The flags are not cleared during context switching
and thus retain their status.
C : Carry flag.
This bit is set when a carry or a borrow occurs dur-
ing arithmetic operations; otherwise it is cleared.
The Carry flag is also set to the value of the bit
tested in a bit test instruction; it also participates in
the rotate left instruction.
0: No carry has occured
1: A carry has occured
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1
Z : Zero flag
This flag is set if the result of the last arithmetic or
logical operation was equal to zero; otherwise it is
cleared.
0: The result of the last operation is different from
zero
1: The result of the last operation is zero
Switching between the three sets of flags is per-
formed automatically when an NMI, an interrupt or
a RETI instruction occurs. As NMI mode is auto-
matically selected after the reset of the MCU, the
ST6 core uses the NMI flags first.
Stack. The ST6 CPU includes a true LIFO (Last In
First Out) hardware stack which eliminates the
need for a stack pointer. The stack consists of six
separate 12-bit RAM locations that do not belong
to the data space RAM area. When a subroutine
call (or interrupt request) occurs, the contents of
each level are shifted into the next level down,
while the content of the PC is shifted into the first
level (the original contents of the sixth stack level
are lost). When a subroutine or interrupt return oc-
curs (RET or RETI instructions), the first level reg-
ister is shifted back into the PC and the value of
each level is popped back into the previous level.
Figure 8. Stack manipulation
PROGRAM
COUNTER
ON RETURN
LEVEL 1
FROM
INTERRUPT,
LEVEL 2
OR
SUBROUTINE
LEVEL 3
LEVEL 4
LEVEL 5
LEVEL 6
Since the accumulator, in common with all other
data space registers, is not stored in this stack,
management of these registers should be per-
formed within the subroutine.
Caution: The stack will remain in its “deepest” po-
sition if more than 6 nested calls or interrupts are
executed, and consequently the last return ad-
dress will be lost.
It will also remain in its highest position if the stack
is empty and a RET or RETI is executed. In this
case the next instruction will be executed.
ON
INTERRUPT,
OR
SUBROUTINE
CALL