參數(shù)資料
型號: PIC12F1840T-I/SN
廠商: Microchip Technology
文件頁數(shù): 31/122頁
文件大小: 0K
描述: MCU 7KB FLASH 256B RAM XLP 8SOIC
標準包裝: 3,300
系列: PIC® XLP™ 12F
核心處理器: PIC
芯體尺寸: 8-位
速度: 32MHz
連通性: I²C,LIN,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 5
程序存儲器容量: 7KB(4K x 14)
程序存儲器類型: 閃存
EEPROM 大小: 256 x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.3 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 4x10b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
包裝: 帶卷 (TR)
PIC12(L)F1840
DS41441B-page 16
Preliminary
2011 Microchip Technology Inc.
FIGURE 3-1:
PROGRAM MEMORY MAP
AND STACK FOR
PIC12(L)F1840
3.1.1
READING PROGRAM MEMORY AS
DATA
There are two methods of accessing constants in pro-
gram memory. The first method is to use tables of
RETLW
instructions. The second method is to set an
FSR to point to the program memory.
3.1.1.1
RETLW
Instruction
The RETLW instruction can be used to provide access
to tables of constants. The recommended way to create
such a table is shown in Example 3-1.
EXAMPLE 3-1:
RETLW
INSTRUCTION
The BRW instruction makes this type of table very sim-
ple to implement. If your code must remain portable
with previous generations of microcontrollers, then the
BRW
instruction is not available so the older table read
method must be used.
PC<14:0>
15
0000h
0004h
Stack Level 0
Stack Level 15
Reset Vector
Interrupt Vector
CALL, CALLW
RETURN, RETLW
Stack Level 1
0005h
On-chip
Program
Memory
Page 0
07FFh
Rollover to Page 0
0800h
0FFFh
1000h
7FFFh
Page 1
Rollover to Page 1
Interrupt, RETFIE
constants
BRW
;Add Index in W to
;program counter to
;select data
RETLW DATA0
;Index0 data
RETLW DATA1
;Index1 data
RETLW DATA2
RETLW DATA3
my_function
;… LOTS OF CODE…
MOVLW
DATA_INDEX
call constants
;… THE CONSTANT IS IN W
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