MC68HC908GR8CD Freescale Semiconductor, MC68HC908GR8CD Datasheet - Page 165

• Manufacturer Part Number: MC68HC908GR8CD
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908GR8CD

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 384 B
• Operating Supply Voltage: 3 V to 5 V
• Package / Case: SOIC-28
• Mounting Style: SMD/SMT
• Data Rom Size: 64 KB
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 21
• Program Memory Type: Flash

18.4.2 Transmitter
Figure 18-4
The baud rate clock source for the SCI can be selected via the configuration bit, SCIBDSRC.
Freescale Semiconductor
CGMXCLK
IT12
SL = 0 => X = A
SL = 1 => X = B
shows the structure of the SCI transmitter.
SCIBDSRC
CONFIG2
A
B
FROM
SL
X
SCR1
SCR2
SCR0
SCP1
SCP0
÷ 4
SCALER
PRE-
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
DIVIDER
BAUD
PEN
PTY
TXINV
Figure 18-4. 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
Functional Description
PE2/TxD
165