参数资料
| 型号： | MCP402XEV |
| 厂商： | Microchip Technology |
| 文件页数： | 35/46页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MCP402X |
| 标准包装： | 1 |
| 主要目的： | 数字电位器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MCP4021 |
| 主要属性： | 1 个单路电位器，10 千欧，64 抽头，非易失 |
| 次要属性： | 2.7 ~ 5.5 V，150 ppm/°C |
| 已供物品： | 2 板，样品，CD |
| 产品目录页面： | 677 (CN2011-ZH PDF) |
| 相关产品： | MCP4021T-503E/MCDKR-ND - IC DGTL POT 50K 1CH 8DFN MCP4021T-502E/MCDKR-ND - IC DGTL POT 5K 1CH 8DFN MCP4021T-202E/MCDKR-ND - IC DGTL POT 2.1K 1CH 8DFN MCP4021T-103E/MCDKR-ND - IC DGTL POT 10K 1CH 8DFN MCP4021T-502E/MS-ND - IC DGTL POT 5K 1CH 8MSOP MCP4021T-202E/MS-ND - IC DGTL POT 2.1K 1CH 8MSOP MCP4021T-503E/MS-ND - IC DGTL POT 50K 1CH 8MSOP MCP4021T-103E/MS-ND - IC DGTL POT 10K 1CH 8MSOP MCP4021T-103E/SN-ND - IC DGTL POT 10K 1CH 8SOIC MCP4021T-202E/SN-ND - IC DGTL POT 2.1K 1CH 8SOIC 更多... |
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00066_MCP402XEV.ASM Source Code
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
;**********************************************************************************************
; General Pupose Register Definitions
;**********************************************************************************************
GPRS UDATA
State res 1 ; variable to track the “state” value
; this code functions as a state machine
; bits 3:0 stores the state 0-15 indicator
; bits 7:6 stores the debounced button states
OldState res 1 ; allows program to see if State changed
Exit res 1 ; variable to count the number ms to test for a button press
DebounceUP res 1 ; variable to count the number of ms UP was pressed
DebounceDOWN res 1 ; variable to count the number of ms DOWN was pressed
DLYCNT1 res 1 ; variable for the delay subroutines
DLYCNT2 res 1 ; variable for the delay subroutines
#define
#define
#define
#define
#define
#define
UD GPIO,1
CS GPIO,0
UP GPIO,1
DOWN GPIO,0
CP GPIO,2
PowerDown GPIO,3
;
;
;
;
;
;
GP1 tied to UD & has “INCR” switch connected via 2.2k resistor
GP0 tied to CS & has “DECR” switch connected via 2.2k resistor
Momentary switch UP
Momentary switch DOWN
OSCOUT pin for Charge Pump
Vpp for programming & PowerDown input to put uC to SLEEP
#define
HV_CS
OSCCAL,FOSC4
; Drives CS to HVDD (drive CS high first)
#define
#define
UP_State State,7
DOWN_State State,6
; Debounced UP State - using bits 5:4 are critical
; Debounced DOWN State - using bits 5:4 are critical
;***********************************************************************************************
; Reset Code
;***********************************************************************************************
RESET CODE ; processor reset vector + 1
;ResetVector ; Device resets to 0x1FF to get the factory calibration
goto Start ; Lower half of memory reserved for subroutines
;***********************************************************************************************
; Main Code
;***********************************************************************************************
MAIN CODE
Start
Init_Oscillator
; Internal RC calibration value is placed at location 0xFF by Microchip
; as a movlw k, where the k is a literal value.
movwf OSCCAL ; update register with factory cal value
; bcf OSCCAL,FOSC4 ; make sure the FOSC4 is disabled to shut charge pump off
StateMachineReset
movlw b’11110011’ ; Disable the Comparator & make inputs digital
movwf CMCON0
; bcf CMCON0, CMPON ; needs to be on to get GP2 as a General Purpose Output
movlw b’10011010’ ; disable Wake-Up on Pin Change,
; enable weak pullups for button inputs
; T0CS must be 0 for GP2 TRIS to be active
; set up for 72ms WDT
option
Init
clrf State
clrf OldState
call InitGPIO ; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
? 2005 Microchip Technology Inc.
DS51546B-page 31
相关PDF资料 |
PDF描述 |
|---|---|
| MCP42XXEV | BOARD EVALUATION MCP42XX |
| MCP43XXEV | BOARD EVALUATION MCP43XX |
| MCP46XXDM-PTPLS | BOARD PICTAIL DIGI POT MCP4XXX |
| MCP46XXEV | EVAL BOARD FOR MCP46XX |
| MCP4XXXDM-DB | BOARD DAUGHTER DIGIPOT MCP4XXX |
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