SMM605
Preliminary Information
I2C PROGRAMMING INFORMATION
SERIAL INTERFACE
Any access to the SMM605 on the I2C bus will
temporarily halt the monitoring function. The SMM605
halts the monitor function from when it acknowledges
the address byte until a valid stop is received.
Access to the configuration registers, general-purpose
memory and command and status registers is carried
out over an industry standard 2-wire serial interface
(I2C). SDA is a bi-directional data line and SCL is a
clock input. Data is clocked in on the rising edge of
SCL and clocked out on the falling edge of SCL. All
data transfers begin with the MSB. During data
transfers SDA must remain stable while SCL is high.
Data is transferred in 8-bit packets with an intervening
clock period in which an Acknowledge is provided by
WRITE
Writing to the memory or a configuration register is
illustrated in Figures 11, 12, 13, 17 and 18. A Start
condition followed by the address byte is provided by
the host; the SMM605 responds with an Acknowledge;
the host then responds by sending the memory
address pointer or configuration register address
pointer; the SMM605 responds with an acknowledge;
the host then clocks in on byte of data. For memory
and configuration register writes, up to 15 additional
bytes of data can be clocked in by the host to write to
consecutive addresses within the same page. After
the last byte is clocked in and the host receives an
Acknowledge, a Stop condition must be issued to
initiate the nonvolatile write operation.
the device receiving data. The SCL high period (tHIGH
)
is used for generating Start and Stop conditions that
precede and end most transactions on the serial bus.
A high-to-low transition of SDA while SCL is high is
considered a Start condition while a low-to-high
transition of SDA while SCL is high is considered a
Stop condition.
The interface protocol allows operation of multiple
devices and types of devices on a single bus through
READ
unique device addressing.
The address byte is
The address pointer for the configuration registers,
memory, command and status registers must be set
before data can be read from the SMM605. This is
accomplished by issuing a dummy write command,
which is simply a write command that is not followed
by a Stop condition. The dummy write command sets
the address from which data is read. After the dummy
write command is issued, a Start command followed
by the address byte is sent from the host. The host
then waits for an Acknowledge and then begins
clocking data out of the slave device. The first byte
read is data from the address pointer set during the
dummy write command. Additional bytes can be
clocked out of consecutive addresses with the host
providing an Acknowledge after each byte. After the
data is read from the desired registers, the read
operation is terminated by the host holding SDA high
during the Acknowledge clock cycle and then issuing a
Stop condition. Refer to Figures 14, 16, 19 and 21 for
an illustration of the read sequence.
comprised of a 4-bit device type identifier (slave
address) and a 3-bit bus address. The remaining bit
indicates either a read or a write operation. Refer to
Table 1 for a description of the address bytes used by
the SMM605.
The device type identifier for the memory array is
generally set to 1010BIN following the industry standard
for a typical nonvolatile memory. There is an option to
change the identifier to 1011BIN allowing it to be used
on a bus that may be occupied by other memory
devices. The configuration registers are grouped with
the memory array and thus use 1010BIN or 1011BIN as
the device type identifier. The command and status
registers are accessible with the separate device type
identifier of 1001BIN
.
The bus address bits A[1:0] are programmed into the
configuration registers. Bus address bit A[2] can be
programmed as either 0 or biased by the A2 pin. The
bus address accessed in the address byte of the serial
data stream must match the setting in the SMM605
and on the A2 pin.
Summit Microelectronics, Inc
2064 1.1 09/16/03
15
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
