MC68HC908JK8CP Freescale Semiconductor, MC68HC908JK8CP Datasheet - Page 124

• Manufacturer Part Number: MC68HC908JK8CP
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908JK8CP

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI
• Program Memory Type: Flash
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 15
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 13-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 20
• Package Type: PDIP
• Lead Free Status / Rohs Status: Not Compliant

Serial Communications Interface (SCI)
9.4.2 Transmitter
Figure 9-4
The baud rate clock source for the SCI is the bus clock.
9.4.2.1 Character Length
The transmitter can accommodate either 8-bit or 9-bit data. The state of the M bit in SCI control register
1 (SCC1) determines character length. When transmitting 9-bit data, bit T8 in SCI control register 3
(SCC3) is the ninth bit (bit 8).
9.4.2.2 Character Transmission
During an SCI transmission, the transmit shift register shifts a character out to the TxD pin. The SCI data
register (SCDR) is the write-only buffer between the internal data bus and the transmit shift register. To
initiate an SCI transmission:
124
BUS CLOCK
shows the structure of the SCI transmitter.
SCR1
SCR2
SCR0
SCP1
SCP0
÷ 4
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
SCALER
PRE-
DIVIDER
BAUD
PEN
PTY
TXINV
Figure 9-4. SCI Transmitter
÷ 16
GENERATION
PARITY
DMATE
DMATE
SCTIE
SCTE
DMATE
SCTE
SCTIE
TC
TCIE
T8
M
H
8
SCTIE
7
SCTE
TCIE
TC
SCI DATA REGISTER
6
SHIFT REGISTER
INTERNAL BUS
TRANSMIT
5
11-BIT
CONTROL LOGIC
4
TRANSMITTER
3
2
1
LOOPS
ENSCI
SBK
TE
0
L
Freescale Semiconductor
TxD