ISD2360SYI Datasheet, PDF (14/32 Pages) List of Unclassifed Manufacturers – Digital ChipCorder with Embedded Flash 3-Channel Audio Playback

PRELIMINARY DATASHEET
Under certain circumstances, it is desirable to protect portions of the internal memory from
write/erase or interrogation (read). The ISD2360 provides a method to achieve this by setting a
protection memory pointer (PMP) that allows the users to protect memory for an address range from
the beginning of memory to this sector containing the PMP pointer. The type of protection is set by
three bits in the memory header byte.
Memory protection is activated on power-up of the chip. Therefore, each time the user changes the
setting of memory protection, the new setting will not be effective until the chip is reset.
8 SPI INTERFACE
This is a standard four-wire serial interface used for communication between ISD2360 and the host. It
consists of an active low slave-select (SSB), a serial clock (SCLK), a data input (Master Out Slave In -
MOSI), and a data output (Master In Slave Out - MISO). In addition, for some transactions requiring
data flow control, a RDY/BSYB signal (pin) is available.
The ISD2360 supports SPI mode 3: (1) SCLK must be high when SPI bus is inactive, and (2) data is
sampled at SCLK rising edge. A SPI transaction begins on the falling edge of SSB and its waveform is
illustrated below:
SSB
SCLK
0 12 3 4 5 6 7 0 1 2 3 4 5 6 7
MISO Z X S7 S6 S5 S4 S3 S2 S1 S0 D7 D6 D5 D4 D3 D2 D1 D0
MOSI
X C7 C6 C5 C4 C3 C2 C1 C0 D7 D6 D5 D4 D3 D2 D1 D0 X
Figure 8-1 SPI Data Transaction.
A transaction begins with sending a command byte (C7-C0) with the most significant bit (MSB – C7)
sent in first. During the byte transmission, the status (S7-S0) of the device is sent out via the MISO
pin. After the byte transmission, depending upon the command sent, one or more bytes of data will be
sent via the MISO pin.
RDY/BSYB pin is used to handshake data into or out of the device. Upon completion of a byte
transmission, RDY/BSYB pin could change its state after the rising edge of the SCLK if the built-in 32-
byte data buffer is either full or empty. At this point, SCLK must remain high until RDY/BSYB pin
returns to high, indicating that the ISD2360 is ready for the next data transmission. See 如下 for
timing diagram.
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Publication Release Date: 4/21/2012
Revision 0.3