参数资料
型号: PIC18F248-E/SO
厂商: Microchip Technology
文件页数: 82/116页
文件大小: 0K
描述: IC MCU FLASH 8KX16 W/CAN 28-SOIC
产品培训模块: Asynchronous Stimulus
标准包装: 27
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 40MHz
连通性: CAN,I²C,SPI,UART/USART
外围设备: 欠压检测/复位,LVD,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 16KB(8K x 16)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 4.2 V ~ 5.5 V
数据转换器: A/D 5x10b
振荡器型: 外部
工作温度: -40°C ~ 125°C
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
包装: 管件
PIC18FXX8
DS41159E-page 66
2006 Microchip Technology Inc.
FIGURE 6-2:
TABLE WRITE OPERATION
6.2
Control Registers
Several control registers are used in conjunction with
the TBLRD and TBLWT instructions. These include the:
EECON1 register
EECON2 register
TABLAT register
TBLPTR registers
6.2.1
EECON1 AND EECON2 REGISTERS
EECON1 is the control register for memory accesses.
EECON2 is not a physical register. Reading EECON2
will read all ‘0’s. The EECON2 register is used
exclusively in the memory write and erase sequences.
Control bit EEPGD determines if the access will be a
program or data EEPROM memory access. When
clear, any subsequent operations will operate on the
data EEPROM memory. When set, any subsequent
operations will operate on the program memory.
Control bit CFGS determines if the access will be to the
Configuration/Calibration
registers
or
to
program
memory/data
EEPROM
memory.
When
set,
subsequent operations will operate on Configuration
registers regardless of EEPGD (see Section 24.0
selection access is determined by EEPGD.
The FREE bit, when set, will allow a program memory
erase operation. When the FREE bit is set, the erase
operation is initiated on the next WR command. When
FREE is clear, only writes are enabled.
The WREN bit, when set, will allow a write operation.
On power-up, the WREN bit is clear. The WRERR bit is
set when a write operation is interrupted by a MCLR
Reset or a WDT Time-out Reset during normal opera-
tion. In these situations, the user can check the
WRERR bit and rewrite the location. It is necessary to
reload the data and address registers (EEDATA and
EEADR) due to Reset values of zero.
Control bits, RD and WR, initiate read and write opera-
tions, respectively. These bits cannot be cleared, only
set, in software. They are cleared in hardware at the
completion of the read or write operation. The inability
to clear the WR bit in software prevents the accidental
or premature termination of a write operation. The RD
bit cannot be set when accessing program memory
(EEPGD = 1).
Table Pointer(1)
Table Latch (8-bit)
TBLPTRH
TBLPTRL
TABLAT
Program Memory
(TBLPTR)
TBLPTRU
Instruction: TBLWT*
Note
1: Table Pointer actually points to one of eight holding registers, the address of which is determined by TBLPTRL<2:0>.
The process for physically writing data to the program memory array is discussed in Section 6.5 “Writing to Flash
Holding Registers
Program Memory
Note:
Interrupt flag bit, EEIF in the PIR2 register,
is set when write is complete. It must be
cleared in software.
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