SAM7X256_14 Datasheet, PDF (114/662 Pages) ATMEL Corporation – ARM-based Flash MCU

Table 20-1. Signal Description List (Continued)
Signal Name
VDDPLL
GND
XIN
TST
PGMEN0
PGMEN1
PGMNCMD
PGMRDY
PGMNOE
PGMNVALID
PGMM[3:0]
PGMD[15:0]
Function
Type
PLL Power Supply
Power
Ground
Ground
Clocks
Main Clock Input.
This input can be tied to GND. In this
case, the device is clocked by the internal
RC oscillator.
Input
Test
Test Mode Select
Input
Test Mode Select
Input
Test Mode Select
Input
PIO
Valid command available
Input
0: Device is busy
1: Device is ready for a new command
Output
Output Enable (active high)
Input
0: DATA[15:0] is in input mode
1: DATA[15:0] is in output mode
Output
Specifies DATA type (See Table 20-2)
Input
Bi-directional data bus
Input/Output
Active
Level
High
High
High
Low
High
Low
Low
Comments
32KHz to 50MHz
Must be connected to VDDIO
Must be connected to VDDIO
Must be connected to VDDIO
Pulled-up input at reset
Pulled-up input at reset
Pulled-up input at reset
Pulled-up input at reset
Pulled-up input at reset
Pulled-up input at reset
20.2.2 Signal Names
Depending on the MODE settings, DATA is latched in different internal registers.
Table 20-2. Mode Coding
MODE[3:0]
Symbol
Data
0000
CMDE
Command Register
0001
ADDR0
Address Register LSBs
0010
ADDR1
0101
DATA
Data Register
Default
IDLE
No register
When MODE is equal to CMDE, then a new command (strobed on DATA[15:0] signals) is stored in the command
register.
Table 20-3. Command Bit Coding
DATA[15:0]
Symbol
0x0011
READ
0x0012
WP
0x0022
WPL
0x0032
EWP
Command Executed
Read Flash
Write Page Flash
Write Page and Lock Flash
Erase Page and Write Page
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
114