PIC17C4X Datasheet, PDF (85/240 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

PIC17C4X
FIGURE 13-3: USART TRANSMIT
Sync
Master/Slave
CK/TX
Sync/Async
Sync/Async
TSR
Start 0 1 • • • 7 8 Stop
BRG
÷4
Sync/Async
Clock
÷ 16
DT
Load
8
TXREG 0 1 • • • 7
Bit Count
TXEN/
Write to TXREG
Interrupt
Data Bus
TXSTA<0>
TXIE
FIGURE 13-4: USART RECEIVE
OSC
BRG
Buffer
CK
Logic
SPEN
Buffer
Logic
RX
÷4
Master/Slave
Sync
Sync/Async
Async/Sync
÷ 16
Majority
Detect
Clock
Data
enable
Bit Count
START
Detect
RSR
MSb
LSb
Stop 8 7 • • • 1 0
Interrupt
RCIE
SREN/
CREN/
Start_Bit
RX9
Async/Sync
RCREG
FERR
FERR
RX9D 7 • • • 1 0
RX9D 7 • • • 1 0
FIFO
Logic
Clk
FIFO
Data Bus
© 1996 Microchip Technology Inc.
DS30412C-page 85