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參數(shù)資料
| 型號(hào)： | PIC12CE674-10/P |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 57/129頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU OTP 2KX14 A/D&EE 8DIP |
| 產(chǎn)品培訓(xùn)模塊： | Asynchronous Stimulus 8-bit PIC® Microcontroller Portfolio |
| 標(biāo)準(zhǔn)包裝： | 60 |
| 系列： | PIC® 12C |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 10MHz |
| 外圍設(shè)備： | POR，WDT |
| 輸入/輸出數(shù)： | 5 |
| 程序存儲(chǔ)器容量： | 3.5KB（2K x 14） |
| 程序存儲(chǔ)器類型： | OTP |
| EEPROM 大?。?/td> | 16 x 8 |
| RAM 容量： | 128 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 3 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 4x8b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 包裝： | 管件 |
| 配用： | ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC |
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1999 Microchip Technology Inc.
DS30561B-page 33
PIC12C67X
6.0
EEPROM PERIPHERAL
OPERATION
The PIC12CE673 and PIC12CE674 each have 16
bytes of EEPROM data memory. The EEPROM mem-
ory has an endurance of 1,000,000 erase/write cycles
and a data retention of greater than 40 years. The
EEPROM data memory supports a bi-directional 2-wire
bus and data transmission protocol. These two-wires
are serial data (SDA) and serial clock (SCL), that are
mapped to bit6 and bit7, respectively, of the GPIO reg-
ister (SFR 06h). Unlike the GP0-GP5 that are con-
nected to the I/O pins, SDA and SCL are only
connected to the internal EEPROM peripheral. For
most applications, all that is required is calls to the
following functions:
; Byte_Write: Byte write routine
;
Inputs: EEPROM Address
EEADDR
;
EEPROM Data
EEDATA
;
Outputs:
Return 01 in W if OK, else
return 00 in W
;
; Read_Current: Read EEPROM at address
currently held by EE device.
;
Inputs: NONE
;
Outputs:
EEPROM Data
EEDATA
;
Return 01 in W if OK, else
return 00 in W
;
; Read_Random: Read EEPROM byte at supplied
address
;
Inputs: EEPROM Address
EEADDR
;
Outputs:
EEPROM Data
EEDATA
;
Return 01 in W if OK,
else return 00 in W
The code for these functions is available on our web
site (www.microchip.com). The code will be accessed
by either including the source code FL67XINC.ASM or
by linking FLASH67X.ASM. FLASH67X.INC provides
external definition to the calling program.
6.0.1
SERIAL DATA
SDA is a bi-directional pin used to transfer addresses
and data into and data out of the device.
For normal data transfer, SDA is allowed to change only
during SCL low. Changes during SCL high are
reserved for indicating the START and STOP condi-
tions.
6.0.2
SERIAL CLOCK
This SCL signal is used to synchronize the data trans-
fer from and to the EEPROM.
6.1
Bus Characteristics
The following bus protocol is to be used with the
EEPROM data memory. In this section, the term “proces-
sor” is used to denote the portion of the PIC12C67X that
interfaces to the EEPROM via software.
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 as a
START or STOP condition.
Accordingly, the following bus conditions have been
defined (Figure 6-3).
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 available data
EEPROM space.
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