參數(shù)資料
型號(hào)： KSZ8863MLL-EVAL
廠商： Micrel Inc
文件頁(yè)數(shù)： 15/106頁(yè)
文件大小： 0K
描述： BOARD EVALUATION FOR KSZ8863MLL
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，以太網(wǎng) PHY
嵌入式： 否
已用 IC / 零件： KSZ8863MLL
已供物品： 板
相關(guān)產(chǎn)品： 576-3751-ND - IC ETHERNET SWITCH 3PORT 48-LQFP
576-3577-ND - IC ETHERNET SW 3PORT 48-LQFP
其它名稱(chēng)： 576-3867
PIC16C72 Series
1998 Microchip Technology Inc.
Preliminary
DS39016A-page 15
2.3
PCL and PCLATH
The program counter (PC) species the address of the
instruction to fetch for execution. The PC is 13 bits
wide. The low byte is called the PCL register. This reg-
ister is readable and writable. The high byte 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 PCLATH register.
Figure 2-9 shows the four situations for the loading of
the PC. Example 1 shows how the PC is loaded on a
write to PCL (PCLATH<4:0>
→ PCH). Example 2
shows how the PC is loaded during a GOTO instruction
(PCLATH<4:3>
→ PCH). Example 3 shows how the PC
is loaded during a CALL instruction (PCLATH<4:3>
→
PCH), with the PC loaded (PUSHed) onto the Top of
Stack. Finally, example 4 shows how the PC is loaded
during one of the return instructions where the PC is
loaded (POPed) from the Top of Stack.
FIGURE 2-9:
LOADING OF PC IN DIFFERENT SITUATIONS
PC
12
8
7
0
5
PCLATH<4:0>
PCLATH
ALU result
Opcode <10:0>
8
PC
12
11 10
0
11
PCLATH<4:3>
PCH
PCL
8
7
2
PCLATH
PCH
PCL
Situation 1 - Instruction with PCL as destination
Situation 2 - GOTO Instruction
STACK (13-bits x 8)
Top of STACK
STACK (13-bits x 8)
Top of STACK
Opcode <10:0>
PC
12
11 10
0
11
PCLATH<4:3>
8
7
2
PCLATH
PCH
PCL
Situation 3 - CALL Instruction
STACK (13-bits x 8)
Top of STACK
Opcode <10:0>
PC
12
11 10
0
11
8
7
PCLATH
PCH
PCL
Situation 4 - RETURN, RETFIE, or RETLW Instruction
STACK (13-bits x 8)
Top of STACK
13
Note: PCLATH is not updated with the contents of PCH.
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