S9S08SG8E2VTG Freescale Semiconductor, S9S08SG8E2VTG Datasheet - Page 178
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S9S08SG8E2VTG
Manufacturer Part Number
S9S08SG8E2VTG
Description
8-bit Microcontrollers - MCU 9S08 UC W/ 8K 0.25UM SGF
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S08SG8E2VTG.pdf
(320 pages)
Specifications of S9S08SG8E2VTG
Rohs
yes
Core
S08
Processor Series
MC9S08SG8
Data Bus Width
8 bit
Maximum Clock Frequency
40 MHz
Program Memory Size
8 KB
Data Ram Size
8 KB
On-chip Adc
Yes
Operating Supply Voltage
2.7 V to 5.5 V
Operating Temperature Range
- 40 C to + 105 C
Package / Case
TSSOP-16
Mounting Style
SMD/SMT
A/d Bit Size
10 bit
A/d Channels Available
12
Interface Type
SCI, SPI
Maximum Operating Temperature
+ 105 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
16
Number Of Timers
2
Program Memory Type
Flash
Supply Voltage - Max
5.5 V
Supply Voltage - Min
2.7 V
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Inter-Integrated Circuit (S08IICV2)
11.4.1.8
The clock synchronization mechanism can be used as a handshake in data transfer. Slave devices may hold
the SCL low after completion of one byte transfer (9 bits). In such a case, it halts the bus clock and forces
the master clock into wait states until the slave releases the SCL line.
11.4.1.9
The clock synchronization mechanism can be used by slaves to slow down the bit rate of a transfer. After
the master has driven SCL low the slave can drive SCL low for the required period and then release it. If
the slave SCL low period is greater than the master SCL low period then the resulting SCL bus signal low
period is stretched.
11.4.2
For 10-bit addressing, 0x11110 is used for the first 5 bits of the first address byte. Various combinations of
read/write formats are possible within a transfer that includes 10-bit addressing.
11.4.2.1
The transfer direction is not changed (see
each slave compares the first seven bits of the first byte of the slave address (11110XX) with its own
address and tests whether the eighth bit (R/W direction bit) is 0. More than one device can find a match
and generate an acknowledge (A1). Then, each slave that finds a match compares the eight bits of the
second byte of the slave address with its own address. Only one slave finds a match and generates an
acknowledge (A2). The matching slave remains addressed by the master until it receives a stop condition
(P) or a repeated start condition (Sr) followed by a different slave address.
After the master-transmitter has sent the first byte of the 10-bit address, the slave-receiver sees an IIC
interrupt. Software must ensure the contents of IICD are ignored and not treated as valid data for this
interrupt.
11.4.2.2
The transfer direction is changed after the second R/W bit (see
acknowledge bit A2, the procedure is the same as that described for a master-transmitter addressing a
slave-receiver. After the repeated start condition (Sr), a matching slave remembers that it was addressed
before. This slave then checks whether the first seven bits of the first byte of the slave address following
Sr are the same as they were after the start condition (S) and tests whether the eighth (R/W) bit is 1. If there
is a match, the slave considers that it has been addressed as a transmitter and generates acknowledge A3.
The slave-transmitter remains addressed until it receives a stop condition (P) or a repeated start condition
(Sr) followed by a different slave address.
174
S
10-bit Address
Table 11-10. Master-Transmitter Addresses Slave-Receiver with a 10-bit Address
Slave Address 1st 7 bits
Handshaking
Clock Stretching
Master-Transmitter Addresses a Slave-Receiver
Master-Receiver Addresses a Slave-Transmitter
11110 + AD10 + AD9
MC9S08SG8 MCU Series Data Sheet, Rev. 7
R/W
0
A1
Table
Slave Address 2nd byte
11-10). When a 10-bit address follows a start condition,
AD[8:1]
Table
A2
Data
11-11). Up to and including
A
...
Data
Freescale Semiconductor
A/A
P
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