PIC16C63A-20/SS【PDF 38/184 页】IC MCU OTP 4KX14 PWM 28SSOP

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132

SAM7S Series [DATASHEET]

6175M–ATARM–26-Oct-12

The Flash command Write Page and Lock (WPL) is equivalent to the Flash Write Command. However, the lock

bit is automatically set at the end of the Flash write operation. As a lock region is composed of several pages, the

programmer writes to the first pages of the lock region using Flash write commands and writes to the last page of

the lock region using a Flash write and lock command.

The Flash command Erase Page and Write (EWP) is equivalent to the Flash Write Command. However, before

programming the load buffer, the page is erased.

The Flash command Erase Page and Write the Lock (EWPL) combines EWP and WPL commands.

20.2.5.3

Flash Full Erase Command

This command is used to erase the Flash memory planes.

All lock regions must be unlocked before the Full Erase command by using the CLB command. Otherwise, the

erase command is aborted and no page is erased.

20.2.5.4

Flash Lock Commands

Lock bits can be set using WPL or EWPL commands. They can also be set by using the Set Lock command

(SLB). With this command, several lock bits can be activated. A Bit Mask is provided as argument to the com-

mand. When bit 0 of the bit mask is set, then the first lock bit is activated.

In the same way, the Clear Lock command (CLB) is used to clear lock bits. All the lock bits are also cleared by the

EA command.

...

Write handshaking

ADDR0

Memory Address LSB

n+1

Write handshaking

ADDR1

Memory Address

n+2

Write handshaking

ADDR2

Memory Address

n+3

Write handshaking

ADDR3

Memory Address

n+4

Write handshaking

DATA

*Memory Address++

n+5

Write handshaking

DATA

*Memory Address++

...

Table 20-9.

Write Command (Continued)

Step

Handshake Sequence

MODE[3:0]

DATA[7:0]

Table 20-10. Full Erase Command

Step

Handshake Sequence

MODE[3:0]

DATA[15:0] or DATA[7:0]

Write handshaking

CMDE

Write handshaking

DATA

Table 20-11. Set and Clear Lock Bit Command

Step

Handshake Sequence

MODE[3:0]

DATA[15:0] or DATA[7:0]

Write handshaking

CMDE

SLB or CLB

Write handshaking

DATA

Bit Mask

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