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MCP43XXEV Evaluation Board User’s Guide
2.4.2
The MCP4361 Device
To make variations to the commands sent to the MCP4361 device (from the commands
shown in the demo section), one must know the device memory map (see Table 2-3)
and the command formats (see Figure 2-3). For additional device operational
information, refer to the MCP4361 device data sheet (DS22233).
TABLE 2-3:
MEMORY MAP AND THE SUPPORTED COMMANDS
Address
00h
Function
Volatile Wiper 0
Memory
Type
RAM
Allowed Commands
Read, Write,
Disallowed
Commands (2)
—
Increment, Decrement
01h
02h
03h
Volatile Wiper 1 RAM Read, Write,
Increment, Decrement
Non-Volatile Wiper 0 EEPROM Read, Write (1)
Non-Volatile Wiper 1 EEPROM Read, Write (1)
—
Increment, Decrement
Increment, Decrement
04h
Volatile
RAM Read, Write
Increment, Decrement
TCON0 Register
05h
Status Register RAM Read
Write, Increment,
Decrement
06h
Volatile Wiper 2
RAM
Read, Write,
—
Increment, Decrement
07h Volatile Wiper 3 RAM Read, Write,
Increment, Decrement
08h Non-Volatile Wiper 2 EEPROM Read, Write (1)
09h Non-Volatile Wiper 3 EEPROM Read, Write (1)
—
Increment, Decrement
Increment, Decrement
0Ah Volatile
TCON1 Register
RAM Read, Write Increment, Decrement
0Bh - 0Fh Data EEPROM EEPROM Read, Write (1)
Increment, Decrement
Note 1:
2:
8-bit Command
(Increment or Decrement)
When an EEPROM write is active, these are invalid commands and will generate
an error condition. The user should use a read of the Status register to determine
when the write cycle has completed. To exit the error condition, the user must take
the CS pin to the V IH level and then back to the active state (V IL or V IHH ).
This command on this address will generate an error condition. To exit the error
condition, the user must take the CS pin to the V IH level and then back to the active
state (V IL or V IHH ).
16-bit Command
(Read Data or Write Data)
Command Byte
Command Byte
Data Byte
A A A A C C D D
D D D D 1 0 9 8
3 2 1 0
A A A A C C D D D D D D D D D D
D D D D 1 0 9 8 7 6 5 4 3 2 1 0
3 2 1 0
Command
Bits
CC
1 0
Register Memory
Address
Data
Bits
Register Memory
Address
Data
Bits
0 0 = Write Data
0 1 = INCR
Command
Bits
Command
Bits
1 0 = DECR
1 1 = Read Data
FIGURE 2-3:
DS51892A-page 18
MCP43XX SPI Command Formats.
? 2010 Microchip Technology Inc.
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