PIC16F747 Microchip Technology Inc., PIC16F747 Datasheet - Page 121

• Manufacturer Part Number: PIC16F747
• Description: 28/40/44-pin, 8-bit Cmos Flash Microcontrollers With 10-bit A/d And Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

10.4.7
In I
reload value is placed in the lower 7 bits of the
SSPADD register (Figure 10-17). When a write occurs
to SSPBUF, the Baud Rate Generator will automatically
begin counting. The BRG counts down to 0 and stops
until another reload has taken place. The BRG count is
decremented twice per instruction cycle (T
Q2 and Q4 clocks. In I
reloaded automatically.
FIGURE 10-17:
TABLE 10-3:
 2004 Microchip Technology Inc.
Note 1:
2
C Master mode, the Baud Rate Generator (BRG)
40 MHz
40 MHz
40 MHz
16 MHz
16 MHz
16 MHz
4 MHz
4 MHz
4 MHz
F
OSC
The I
100 kHz) in all details, but may be used with care where higher rates are required by the application.
BAUD RATE GENERATOR
2
C™ interface does not conform to the 400 kHz I
I
2
C™ CLOCK RATE w/BRG
BAUD RATE GENERATOR BLOCK DIAGRAM
SSPM3:SSPM0
2
C Master mode, the BRG is
10 MHz
10 MHz
10 MHz
4 MHz
4 MHz
4 MHz
1 MHz
1 MHz
1 MHz
F
SCL
CY
SSPM3:SSPM0
CY
) on the
Control
Reload
CLKO
20 MHz
20 MHz
20 MHz
8 MHz
8 MHz
8 MHz
2 MHz
2 MHz
2 MHz
F
CY
*2
Reload
Once the given operation is complete (i.e., transmis-
sion of the last data bit is followed by ACK), the internal
clock will automatically stop counting and the SCL pin
will remain in its last state.
Table 10-3 demonstrates clock rates based on
instruction cycles and the BRG value loaded into
SSPADD.
BRG Down Counter
2
C specification (which applies to rates greater than
SSPADD<6:0>
BRG Value
0Ch
18h
1Fh
63h
09h
27h
02h
09h
00h
PIC16F7X7
F
OSC
/4
(2 Rollovers of BRG)
DS30498C-page 119
400 kHz
400 kHz
333 kHz
312.5 kHz
1 MHz
100 kHz
308 kHz
100 kHz
100 kHz
F
SCL
(1)
(1)
(1)
(1)