Freescale Semiconductor DEMO9S08DZ60 Demo Board DEMO9S08DZ60 DEMO9S08DZ60 Ficha De Dados
Códigos do produto
DEMO9S08DZ60
Chapter 14 Serial Communications Interface (S08SCIV4)
MC9S08DZ60 Series Data Sheet, Rev. 4
292
Freescale Semiconductor
14.1.4
Block Diagram
shows the transmitter portion of the SCI.
Figure 14-2. SCI Transmitter Block Diagram
H
8
7
6
5
4
3
2
1
0
L
SCID – Tx BUFFER
(WRITE-ONLY)
INTERNAL BUS
STOP
11-BIT TRANSMIT SHIFT REGISTER
START
SHIFT DIRECTION
LSB
1
× BAUD
RATE CLOCK
PARITY
GENERATION
TRANSMIT CONTROL
SHIFT ENABLE
PREAMBLE (ALL 1s)
BREAK (ALL 0s)
SCI CONTROLS TxD
TxD DIRECTION
TO TxD
PIN LOGIC
PIN LOGIC
LOOP
CONTROL
TO RECEIVE
DATA IN
DATA IN
TO TxD PIN
Tx INTERRUPT
REQUEST
REQUEST
LO
AD FR
OM SCIxD