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FM8PE53B Datasheet(PDF) 7 Page - Feeling Technology Corp.

Part # FM8PE53B
Description  OTP-Based 8-Bit Microcontroller
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Manufacturer  FEELING [Feeling Technology Corp.]
Direct Link  http://www.feeling-tech.com.tw/
Logo FEELING - Feeling Technology Corp.

FM8PE53B Datasheet(HTML) 7 Page - Feeling Technology Corp.

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FM8PE53B
Web site: http://www.feeling-tech.com.tw
Rev1.02.011 Aug 21, 2014
P.7/FM8PE53B
FEELING
TECHNOLOGY
2.1.2
TMR0 (Time Clock/Counter register)
Address
Name
B7
B6
B5
B4
B3
B2
B1
B0
01h (r/w)
TMR0
8-bit real-time clock/counter
The Timer0 is a 8-bit timer/counter. The clock source of Timer0 can come from the instruction cycle clock or by an
external clock source (T0CKI pin) defined by T0CS bit (OPTION<5>). If T0CKI pin is selected, the Timer0 is
increased by T0CKI signal rising/falling edge (selected by T0SE bit (OPTION<4>)).
The prescaler is assigned to Timer0 by clearing the PSA bit (OPTION<3>). In this case, the prescaler will be
cleared when TMR0 register is written with a value.
2.1.3
PCL (Low Bytes of Program Counter) & Stack
Address
Name
B7
B6
B5
B4
B3
B2
B1
B0
02h (r/w)
PCL
Low order 8 bits of PC
FM8PE53B device has a 10-bit wide Program Counter (PC) and five-level deep 10-bit hardware push/pop stack.
The low byte of PC is called the PCL register. This register is readable and writable. The high byte of PC is called
the PCH register. This register contains the PC<9:8> bits and is not directly readable or writable. All updates to
the PCH register go through the PCHBUF register. As a program instruction is executed, the Program Counter
will contain the address of the next program instruction to be executed. The PC value is increased by one, every
instruction cycle, unless an instruction changes the PC.
For a GOTO instruction, the PC<9:0> is provided by the GOTO instruction word. The PCL register is mapped to
PC<7:0>, and the PCHBUF register is not updated.
For a CALL instruction, the PC<9:0> is provided by the CALL instruction word. The next PC will be loaded
(PUSHed) onto the top of STACK. The PCL register is mapped to PC<7:0>, and the PCHBUF register is not
updated.
For a RETIA, RETFIE, or RETURN instruction, the PC are updated (POPed) from the top of STACK. The PCL
register is mapped to PC<7:0>, and the PCHBUF register is not updated.
For any instruction where the PCL is the destination, the PC<7:0> is provided by the instruction word or ALU
result. However, the PC<9:8> will come from the PCHBUF<1:0> bits (PCHBUF  PCH).
PCHBUF register is never updated with the contents of PCH.


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