參數(shù)資料
型號: DM164134
廠商: Microchip Technology
文件頁數(shù): 32/116頁
文件大?。?/td> 0K
描述: KIT DEV PIC18F4XK22
標準包裝: 1
系列: PIC® 18F
類型: MCU
適用于相關(guān)產(chǎn)品: PIC18F4XK22,PIC18F2XK22
所含物品: 板,文檔
2009 Microchip Technology Inc.
Preliminary
DS41364D-page 283
PIC16F193X/LF193X
23.7
Baud Rate Generator
The MSSP module has a Baud Rate Generator avail-
able for clock generation in both I2C and SPI Master
modes. The Baud Rate Generator (BRG) reload value
is placed in the SSPADD register (Register 23-6).
When a write occurs to SSPBUF, the Baud Rate Gen-
erator will automatically begin counting down.
Once the given operation is complete, the internal clock
will automatically stop counting and the clock pin will
remain in its last state.
An internal signal “Reload” in Figure 23-39 triggers the
value from SSPADD to be loaded into the BRG counter.
This occurs twice for each oscillation of the module
clock line. The logic dictating when the reload signal is
asserted depends on the mode the MSSP is being
operated in.
Table 23-4 demonstrates clock rates based on
instruction cycles and the BRG value loaded into
SSPADD.
EQUATION 23-1:
FIGURE 23-40:
BAUD RATE GENERATOR BLOCK DIAGRAM
TABLE 23-4:
MSSP CLOCK RATE W/BRG
FCLOCK
FOSC
SSPxADD
1
+
4
-------------------------------------------------
=
Note:
Values of 0x00, 0x01 and 0x02 are not valid
for SSPADD when used as a Baud Rate
Generator for I2C. This is an implementation
limitation.
FOSC
FCY
BRG Value
FCLOCK
(2 Rollovers of BRG)
32 MHz
8 MHz
13h
400 kHz(1)
32 MHz
8 MHz
19h
308 kHz
32 MHz
8 MHz
4Fh
100 kHz
16 MHz
4 MHz
09h
400 kHz(1)
16 MHz
4 MHz
0Ch
308 kHz
16 MHz
4 MHz
27h
100 kHz
4 MHz
1 MHz
09h
100 kHz
Note 1:
The I2C interface does not conform to the 400 kHz I2C specification (which applies to rates greater than
100 kHz) in all details, but may be used with care where higher rates are required by the application.
SSPM<3:0>
BRG Down Counter
SSPCLK
FOSC/2
SSPADD<7:0>
SSPM<3:0>
SCL
Reload
Control
Reload
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