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參數(shù)資料
| 型號(hào)： | PIC16CE625T-30/SS |
| 廠商： | Microchip Technology |
| 文件頁(yè)數(shù)： | 39/100頁(yè) |
| 文件大小： | 0K |
| 描述： | IC MCU OTP 2KX14 EE COMP 20SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,600 |
| 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(cè)/復(fù)位，POR，WDT |
| 輸入/輸出數(shù)： | 13 |
| 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> | 128 x 8 |
| RAM 容量： | 128 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： | 20-SSOP（0.209"，5.30mm 寬） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | PIC16CE625T30/SS |
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1999 Microchip Technology Inc.
DS40182C-page 33
PIC16CE62X
FIGURE 6-6:
PAGE WRITE
S
P
BUS ACTIVITY
PROCESSOR
SDA LINE
BUS ACTIVITY
S
T
A
R
T
S
T
O
P
CONTROL
BYTE
WORD
ADDRESS (n)
DATAn
DATAn + 7
DATAn + 1
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
6.5
Read Operation
Read operations are initiated in the same way as write
operations with the exception that the R/W bit of the
EEPROM address is set to one. There are three basic
types of read operations: current address read, random
read, and sequential read.
6.6
Current Address Read
The EEPROM contains an address counter that main-
tains the address of the last word accessed, internally
incremented by one. Therefore, if the previous access
(either a read or write operation) was to address n, the
next current address read operation would access data
from address n + 1. Upon receipt of the EEPROM
address with R/W bit set to one, the EEPROM issues
an acknowledge and transmits the eight bit data word.
The processor will not acknowledge the transfer, but
does generate a stop condition and the EEPROM dis-
continues transmission (Figure 6-7).
6.7
Random Read
Random read operations allow the processor to access
any memory location in a random manner. To perform
this type of read operation, first the word address must
be set. This is done by sending the word address to the
EEPROM as part of a write operation. After the word
address is sent, the processor generates a start condi-
tion following the acknowledge. This terminates the
write operation, but not before the internal address
pointer is set. Then the processor issues the control
byte again, but with the R/W bit set to a one. The
EEPROM will then issue an acknowledge and trans-
mits the eight bit data word. The processor will not
acknowledge the transfer, but does generate a stop
condition and the EEPROM discontinues transmission
6.8
Sequential Read
Sequential reads are initiated in the same way as a ran-
dom read except that after the EEPROM transmits the
first data byte, the processor issues an acknowledge as
opposed to a stop condition in a random read. This
directs the EEPROM to transmit the next sequentially
addressed 8-bit word (Figure 6-9).
To provide sequential reads, the EEPROM contains an
internal address pointer which is incremented by one at
the completion of each operation. This address pointer
allows the entire memory contents to be serially read
during one operation.
6.9
Noise Protection
The EEPROM employs a VCC threshold detector cir-
cuit, which disables the internal erase/write logic if the
VCC is below 1.5 volts at nominal conditions.
The SCL and SDA inputs have Schmitt trigger and filter
circuits, which suppress noise spikes to assure proper
device operation even on a noisy bus.
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