CC1010-RTY1 datasheet(39/152 Pages) TI

39 / 152 page

CC1010

SWRS047

Page 39 of 152

Figure 5. SPI Flash Programming Timing

Symbol

Min

Max

Units

Conditions

Fsck

fXOSC / 8

Tsck, high

⋅ TXOSC

The minimum time

SCK must be held high

Tsck, low

⋅ TXOSC

The minimum time

SCK must be held low

Tsck, rise

TXOSC /2

The maximum rise time on

SCK

Tsck, fall

TXOSC /2

The maximum fall time on

SCK

Tsi, setup

TXOSC

The minimum setup time for

SI before the positive edge

SCK

Tsi, hold

TXOSC

The minimum hold time for

SI after the positive edge on

SCK

Tso, delay

TXOSC

The delay from the negative edge on

SCK to valid data

Table 17. SPI Flash Programming Timing Parameters

15.12.2 Programming Enable

Programming Enable is always the first

instruction to be sent. It must be sent to

synchronise the data flow and enable

CC1010 to receive further instructions.

Synchronisation is achieved when byte 2

of the instruction (0x53) is echoed back

from the SPI interface as byte 3. If

synchronisation is not achieved, byte 3 will

return all zeros. In this case, an extra clock

pulse should be inserted on SCK, and the

Programming Enable instruction should be

resent. If synchronisation is not successful

within 32 attempts, Programming Enable

is unsuccessful and further debugging is

needed.

15.12.3 Set Flash Timing

The Set Flash Timing instruction is needed

to generate internal timing for the Flash

module. FLTIM must be set in instruction

byte 4 so that:

MHz

XOSC

≤

≤ FLTIM

It is recommended to set FLTIM to the

smallest number satisfying the equation

above, to reduce the time needed for

Flash programming. For a 3.6864 MHz

crystal, FLTIM should be set to 5.

15.12.4 Chip Erase

The Chip Erase instruction erases all data

in the Flash memory, including the lock

bits. All bits will be set high.

Wait 450 ms (depending on Set Flash

Timing) after sending the Chip Erase

instruction

before

issuing

new

instruction.

15.12.5 Load Program Memory Page

The

Load

Program

Memory

Page

instruction is used to load the 128 bytes of

data in a page to a buffer in RAM. Each

instruction writes one byte to the 7 bit

address specified in the instruction.

SCK (P0.0)

SI (P0.1)

SO (P0.2)

Tsck, high

Tsck, low

Tsck, rise

Tsck, fall

Tsi, setup

Tsi, hold

Tso, delay

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