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| 型號： | PIC16CE624T-30/SO |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 36/100頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU OTP 1KX14 EE COMP 18SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,100 |
| 系列： | PIC® 16C |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 30MHz |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，WDT |
| 輸入/輸出數(shù)： | 13 |
| 程序存儲器容量： | 1.75KB（1K x 14） |
| 程序存儲器類型： | OTP |
| EEPROM 大小： | 128 x 8 |
| RAM 容量： | 96 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 3 V ~ 5.5 V |
| 振蕩器型： | 外部 |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 18-SOIC（0.295"，7.50mm 寬） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | PIC16CE624T30/SO |
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PIC16CE62X
DS40182C-page 30
1999 Microchip Technology Inc.
6.1
Bus Characteristics
In this section, the term “processor” refers to the portion
of the PIC16CE62X that interfaces to the EEPROM
through software manipulating the EEINTF register.
The following bus protocol is to be used with the
EEPROM data memory.
Data transfer may be initiated only when the bus
is not busy.
During data transfer, the data line must remain
stable whenever the clock line is HIGH. Changes
in the data line while the clock line is HIGH will be
interpreted by the EEPROM as a START or STOP
condition.
Accordingly, the following bus conditions have been
defined (Figure 6-1).
6.1.1
BUS NOT BUSY (A)
Both data and clock lines remain HIGH.
6.1.2
START DATA TRANSFER (B)
A HIGH to LOW transition of the SDA line while the
clock (SCL) is HIGH determines a START condition. All
commands must be preceded by a START condition.
6.1.3
STOP DATA TRANSFER (C)
A LOW to HIGH transition of the SDA line while the
clock (SCL) is HIGH determines a STOP condition. All
operations must be ended with a STOP condition.
6.1.4
DATA VALID (D)
The state of the data line represents valid data when,
after a START condition, the data line is stable for the
duration of the HIGH period of the clock signal.
The data on the line must be changed during the LOW
period of the clock signal. There is one bit of data per
clock pulse.
Each data transfer is initiated with a START condition
and terminated with a STOP condition. The number of
the data bytes transferred between the START and
STOP conditions is determined by the processor and
is theoretically unlimited, although only the last sixteen
will be stored when doing a write operation. When an
overwrite does occur, it will replace data in a first-in,
first-out fashion.
6.1.5
ACKNOWLEDGE
The EEPROM will generate an acknowledge after the
reception of each byte. The processor must generate
an extra clock pulse which is associated with this
acknowledge bit.
When the EEPROM acknowledges, it pulls down the
SDA line during the acknowledge clock pulse in such a
way that the SDA line is stable LOW during the HIGH
period of the acknowledge related clock pulse.
Of
course, setup and hold times must be taken into
account. The processor must signal an end of data to
the EEPROM by not generating an acknowledge bit on
the last byte that has been clocked out of the EEPROM.
In this case, the EEPROM must leave the data line
HIGH to enable the processor to generate the STOP
condition (Figure 6-2).
Note:
Acknowledge bits are not generated if an
internal programming cycle is in progress.
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