PIC16F1512T-E/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F1512T-E/SO

28-Pin Flash Microcontrollers with XLP Technology

Microchip Technology 

PIC16(L)F1512/3

20.7 BAUD RATE GENERATOR

The MSSP module has a Baud Rate Generator

available for clock generation in both I2C and SPI

Master modes. The Baud Rate Generator (BRG)

reload value is placed in the SSPADD register

(Register 20-6). When a write occurs to SSPBUF, the

Baud Rate Generator 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 20-39 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 20-4 demonstrates clock rates based on

instruction cycles and the BRG value loaded into

SSPADD.

EQUATION 20-1:

FCLOCK = ---S---S----P----A----FD---O-D---S--C-+------1--------4----

FIGURE 20-40:

BAUD RATE GENERATOR BLOCK DIAGRAM

SSPM<3:0>

SSPADD<7:0>

SSPM<3:0>

SCL

Reload

Control

Reload

SSPCLK

BRG Down Counter

FOSC/2

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.

TABLE 20-4: MSSP CLOCK RATE W/BRG

FOSC

FCY

BRG Value

FCLOCK

(2 Rollovers of BRG)

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: Refer to the I/O port electrical specifications in Table 25-4 to ensure the system is designed to support lol

requirements.

DS40001624C-page 222

 2012-2014 Microchip Technology Inc.

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