参数资料
型号: PIC18F23K20-I/ML
厂商: Microchip Technology
文件页数: 16/42页
文件大小: 0K
描述: IC PIC MCU FLASH 4KX16 28-QFN
产品培训模块: XLP Deep Sleep Mode
8-bit PIC® Microcontroller Portfolio
标准包装: 61
系列: PIC® XLP™ 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 64MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,HLVD,POR,PWM,WDT
输入/输出数: 24
程序存储器容量: 8KB(4K x 16)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 3.6 V
数据转换器: A/D 11x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-VQFN 裸露焊盘
包装: 管件
产品目录页面: 655 (CN2011-ZH PDF)
2009 Microchip Technology Inc.
Advance Information
DS41297F-page 23
PIC18F2XK20/4XK20
3.5
Boot Block Programming
The code sequence detailed in Table 3-5 should be
used, except that the address used in “Step 2” will be in
the range of 000000h to 0007FFh.
3.6
Configuration Bits Programming
Unlike code memory, the Configuration bits are
programmed a byte at a time. The Table Write, Begin
Programming 4-bit command (‘1111’) is used, but only
8 bits of the following 16-bit payload will be written. The
LSB of the payload will be written to even addresses
and the MSB will be written to odd addresses. The
code sequence to program two consecutive configura-
tion locations is shown in Table 3-9. See Figure 3-5 for
the timing diagram.
TABLE 3-9:
SET ADDRESS POINTER TO CONFIGURATION LOCATION
FIGURE 3-8:
CONFIGURATION PROGRAMMING FLOW
Note:
The address must be explicitly written for
each byte programmed. The addresses
can not be incremented in this mode.
4-bit
Command
Data Payload
Core Instruction
Step 1: Direct access to config memory.
0000
8E A6
8C A6
84 A6
BSF
EECON1, EEPGD
BSF
EECON1, CFGS
BSF
EECON1, WREN
Step 2(1): Set Table Pointer for config byte to be written. Write even/odd addresses.
0000
1111
0000
1111
0000
0E 30
6E F8
0E 00
6E F7
0E 00
6E F6
<MSB ignored><LSB>
00 00
0E 01
6E F6
<MSB><LSB ignored>
00 00
MOVLW
30h
MOVWF
TBLPTRU
MOVLW
00h
MOVWF
TBLPRTH
MOVLW
00h
MOVWF
TBLPTRL
Load 2 bytes and start programming.
NOP - hold PGC high for time P9 and low for time P10.
MOVLW
01h
MOVWF
TBLPTRL
Load 2 bytes and start programming.
NOP - hold PGC high for time P9A and low for time P10.
Note 1:
Enabling the write protection of Configuration bits (WRTC = 0 in CONFIG6H) will prevent further writing of
Configuration bits. Always write all the Configuration bits before enabling the write protection for
Configuration bits.
Load Even
Configuration
Start
Program
MSB
Delay P9 and P10
Time for Write
LSB
Load Odd
Configuration
Address
Done
Start
Delay P9 and P10
Time for Write
Done
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