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FM8PE581M Datasheet(PDF) 9 Page - Feeling Technology Corp.

Part # FM8PE581M
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.

FM8PE581M Datasheet(HTML) 9 Page - Feeling Technology Corp.

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FM8PE581M
Web site: http://www.feeling-tech.com.tw
Rev1.00.006 Dec 01, 2016
Page 9 of 87, FM8PE581M
FEELING
TECHNOLOGY
2.1.2
PCL (Low Byte of Program Counter) & Stack
Read/Write-POR
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
Address
Name
B7
B6
B5
B4
B3
B2
B1
B0
0x002
PCL
Low order 8 bits of PC
Note: more bits default state, please refer to Table 2.8.
FM8PE581M device has 13-bit wide Program Counter (PC) and eight-level deep 13-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<12:8> 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<12:0> 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<12:0> 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 RETURN, RETFIE or RETIA 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<12:8> will come from the PCHBUF<4:0> bits (PCHBUF  PCH).
PCHBUF only when the PCL is written, will be updated to the PCH.
Figure 2.2: Loading of PC in Different Situations
Situation 1: GOTO Instruction
PCL
Opcode <12:0>
PCH
7
0
8
9
PC
10
11
12
-
-
-
U
U
U
U
U
PCHBUF
U = Unchanged
Situation 2: CALL Instruction
PCL
Opcode <12:0>
PCH
STACK<12:0>
PC
7
0
8
9
10
11
12
-
-
-
U
U
U
U
U
PCHBUF
U = Unchanged


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