參數(shù)資料
型號(hào)： PIC18F6720T-I/PT
廠商： Microchip Technology
文件頁數(shù)： 106/165頁
文件大小： 0K
描述： IC MCU FLASH 64KX16 W/AD 64-TQFP
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
標(biāo)準(zhǔn)包裝： 1,200
系列： PIC® 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 25MHz
連通性： I²C，SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，LVD，POR，PWM，WDT
輸入/輸出數(shù)： 52
程序存儲(chǔ)器容量： 128KB（64K x 16）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量： 3.75K x 8
電壓 - 電源 (Vcc/Vdd)： 4.2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 12x10b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 64-TQFP
包裝： 帶卷 (TR)
配用： MA180020-ND - MODULE PLUG-IN HPC EXPL 18F87J11
2004 Microchip Technology Inc.
DS39609B-page 43
PIC18F6520/8520/6620/8620/6720/8720
REGISTER 4-2:
STKPTR REGISTER
FIGURE 4-3:
RETURN ADDRESS STACK AND ASSOCIATED REGISTERS
4.2.3
PUSH AND POP INSTRUCTIONS
Since the Top-of-Stack (TOS) is readable and writable,
the ability to push values onto the stack and pull values
off the stack, without disturbing normal program
execution, is a desirable option. To push the current PC
value onto the stack, a PUSH instruction can be
executed. This will increment the stack pointer and load
the current PC value onto the stack. TOSU, TOSH and
TOSL can then be modified to place a return address
on the stack.
The ability to pull the TOS value off of the stack and
replace it with the value that was previously pushed
onto the stack, without disturbing normal execution, is
achieved by using the POP instruction. The POP
instruction discards the current TOS by decrementing
the stack pointer. The previous value pushed onto the
stack then becomes the TOS value.
4.2.4
STACK FULL/UNDERFLOW RESETS
These Resets are enabled by programming the
STVREN configuration bit. When the STVREN bit is
disabled, a full or underflow condition will set the
appropriate STKFUL or STKUNF bit, but not cause a
device Reset. When the STVREN bit is enabled, a full
or underflow condition will set the appropriate STKFUL
or STKUNF bit and then cause a device Reset. The
STKFUL or STKUNF bits are only cleared by the user
software or a POR Reset.
R/C-0
U-0
R/W-0
STKFUL(1) STKUNF(1)
—
SP4
SP3
SP2
SP1
SP0
bit 7
bit 0
bit 7
STKFUL: Stack Full Flag bit
1
= Stack became full or overflowed
0
= Stack has not become full or overflowed
bit 6
STKUNF: Stack Underflow Flag bit
1
= Stack underflow occurred
0
= Stack underflow did not occur
bit 5
Unimplemented: Read as ‘0’
bit 4-0
SP4:SP0: Stack Pointer Location bits
Note 1: Bit 7 and bit 6 can only be cleared in user software or by a POR.
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
00011
0x001A34
11111
11110
11101
00010
00001
00000
00010
Return Address Stack
Top-of-Stack
0x000D58
TOSL
TOSH
TOSU
0x34
0x1A
0x00
STKPTR<4:0>
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