參數(shù)資料
型號: PIC18F25K20-I/ML
廠商: Microchip Technology
文件頁數(shù): 19/42頁
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 16KX16 28QFN
產(chǎn)品培訓模塊: PIC18 K-Series
XLP Deep Sleep Mode
8-bit PIC® Microcontroller Portfolio
標準包裝: 61
系列: PIC® XLP™ 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 64MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,HLVD,POR,PWM,WDT
輸入/輸出數(shù): 24
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 閃存
EEPROM 大小: 256 x 8
RAM 容量: 1.5K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 11x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-VQFN 裸露焊盤
包裝: 管件
產(chǎn)品目錄頁面: 656 (CN2011-ZH PDF)
配用: AC164112-ND - VOLTAGE LIMITER MPLAB ICD2 VPP
AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
PIC18F2XK20/4XK20
DS41297F-page 26
Advance Information
2009 Microchip Technology Inc.
4.3
Verify Configuration Bits
A configuration address may be read and output on
PGD via the 4-bit command, ‘1001’. Configuration data
is read and written in a byte-wise fashion, so it is not
necessary to merge two bytes into a word prior to a
compare. The result may then be immediately
compared to the appropriate configuration data in the
programmer’s
memory
for
verification.
Refer
to
Configuration Bits” for implementation details of
reading configuration data.
4.4
Read Data EEPROM Memory
Data EEPROM is accessed one byte at a time via an
Address Pointer (register pair EEADRH:EEADR) and a
data latch (EEDATA). Data EEPROM is read by loading
EEADRH:EEADR with the desired memory location
and initiating a memory read by appropriately configur-
ing the EECON1 register. The data will be loaded into
EEDATA, where it may be serially output on PGD via
the 4-bit command, ‘0010’ (Shift Out Data Holding
register). A delay of P6 must be introduced after the
falling edge of the 8th PGC of the operand to allow
PGD to transition from an input to an output. During this
time, PGC must be held low (see Figure 4-4).
The command sequence to read a single byte of data
is shown in Table 4-2.
FIGURE 4-3:
READ DATA EEPROM
FLOW
TABLE 4-2:
READ DATA EEPROM MEMORY
Start
Set
Address
Read
Byte
Done
No
Yes
done?
Move to TABLAT
Shift Out Data
4-bit
Command
Data Payload
Core Instruction
Step 1: Direct access to data EEPROM.
0000
9E A6
9C A6
BCF
EECON1, EEPGD
BCF
EECON1, CFGS
Step 2: Set the data EEPROM Address Pointer.
0000
0E <Addr>
6E A9
OE <AddrH>
6E AA
MOVLW
<Addr>
MOVWF
EEADR
MOVLW
<AddrH>
MOVWF
EEADRH
Step 3: Initiate a memory read.
0000
80 A6
BSF
EECON1, RD
Step 4: Load data into the Serial Data Holding register.
0000
0010
50 A8
6E F5
00 00
<MSB><LSB>
MOVF
EEDATA, W, 0
MOVWF TABLAT
NOP
Shift Out Data
(1)
Note
1:
The <LSB> is undefined. The <MSB> is the data.
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