参数资料
型号: PIC18F23K20T-I/SS
厂商: Microchip Technology
文件页数: 3/42页
文件大小: 0K
描述: IC PIC MCU FLASH 4KX16 28-SSOP
标准包装: 2,100
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-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
其它名称: PIC18F23K20T-I/SSTR
2009 Microchip Technology Inc.
Advance Information
DS41297F-page 11
PIC18F2XK20/4XK20
2.6
Entering and Exiting Low-Voltage
ICSP Program/Verify Mode
When the LVP Configuration bit is ‘1’ (see Section 5.3
the
Low-
Voltage ICSP mode is enabled. As shown in Figure 2-14,
Low-Voltage ICSP Program/Verify mode is entered by
holding PGC and PGD low, placing a logic high on PGM
and then raising MCLR/VPP/RE3 to VIH. In this mode, the
RB5/PGM pin is dedicated to the programming function
and ceases to be a general purpose I/O pin. Figure 2-15
shows the exit sequence.
The sequence that enters the device into the Program/
Verify mode places all unused I/Os in the high-impedance
state.
FIGURE 2-14:
ENTERING LOW-VOLTAGE
PROGRAM/VERIFY MODE
FIGURE 2-15:
EXITING LOW-VOLTAGE
PROGRAM/VERIFY MODE
2.7
Serial Program/Verify Operation
The PGC pin is used as a clock input pin and the PGD
pin is used for entering command bits and data input/
output during serial operation. Commands and data are
transmitted on the rising edge of PGC, latched on the
falling edge of PGC and are Least Significant bit (LSb)
first.
2.7.1
4-BIT COMMANDS
All instructions are 20 bits, consisting of a leading 4-bit
command followed by a 16-bit operand, which depends
on the type of command being executed. To input a
command, PGC is cycled four times. The commands
needed for programming and verification are shown in
Depending on the 4-bit command, the 16-bit operand
represents 16 bits of input data or 8 bits of input data
and 8 bits of output data.
Throughout this specification, commands and data are
presented as illustrated in Table 2-7. The 4-bit com-
mand is shown Most Significant bit (MSb) first. The
command operand, or “Data Payload”, is shown
<MSB><LSB>. Figure 2-16 demonstrates how to
serially present a 20-bit command/operand to the
device.
2.7.2
CORE INSTRUCTION
The core instruction passes a 16-bit instruction to the
CPU core for execution. This is needed to set up
registers as appropriate for use with other commands.
TABLE 2-6:
COMMANDS FOR
PROGRAMMING
MCLR/VPP/RE3
P12
PGD
PGD = Input
PGC
PGM
P15
VDD
VIH
MCLR/VPP/RE3
P16
PGD
PGD = Input
PGC
PGM
P18
VDD
VIH
Description
4-Bit
Command
Core Instruction
(Shift in16-bit instruction)
0000
Shift out TABLAT register
0010
Table Read
1000
Table Read, post-increment
1001
Table Read, post-decrement
1010
Table Read, pre-increment
1011
Table Write
1100
Table Write, post-increment by 2
1101
Table Write, start programming,
post-increment by 2
1110
Table Write, start programming
1111
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