ZSSC3016 datasheet(21/46 Pages) RENESAS

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ZSSC3016 Datasheet

January 25, 2016

3.4.

Command Interpretation

3.4.1.

SPI/I

2C™ Commands

The user-accessible section of memory includes addresses 00HEX through 17HEX in the OTP memory that is

designated by the user memory page pointer. Because each of the four OTP memory pages cannot be rewritten

or erased, the memory page pointer must be incremented to the next OTP memory page in order to write to

memory again (see Table 3.1 for the command). After all four user-accessible OTP memory pages have been

used, further write operations are not possible and the “Memory Full” bit is returned as set in the status byte after

write operations (see section 3.5.1).

The SPI/I

2C™ commands supported by the ZSSC3016 are listed in Table 3.1. The command to read an address

in the user memory is the same as its address. The command to read the 16-bit memory status of the data at an

address in user memory is the address plus 20HEX. The command to write to an address in user memory is the

address plus 40HEX.

There is a IDT-reserved section of memory, which can be read but not over-written by the user.

Table 3.1

SPI/I

2C™ Commands

Command

(Byte)

Returns

Description

Normal

Mode

Command

Mode

00HEX to 17HEX

16-bit user data

Read data in user memory address

matching command (addresses 00HEX to

17HEX; might not be using all addresses).

yes

20HEX to 37HEX

16-bit user memory

status

Read memory status for address specified

by command minus 20HEX (addresses 00HEX

to 17HEX respectively; see section 3.6.2 for a

description of the memory status).

yes

40HEX to 57HEX +

data (0000HEX to

FFFFHEX)

—

Write data to user memory at address

specified by command minus 40HEX

(addresses 00HEX to 17HEX respectively;

might not be using all addresses).

yes

70HEX to 7EHEX

16-bit IDT-reserved

memory data

Read data in IDT-reserved memory at

address specified by command minus 70HEX

nd set of addresses 00

HEX to 0EHEX

respectively).

yes

80HEX to 8EHEX

16-bit IDT-reserved

memory status

Read memory status bytes for IDT-reserved

memory data at address specified by

command minus 80HEX (2

nd set of addresses

00HEX to 0EHEX respectively; see section

3.6.2 for a description of the memory status

bytes).

yes

5EHEX

—

Increment user memory page pointer.

yes

* Every response starts with a status byte followed by the data word as described in section 3.5.1.

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