HT32F1253 datasheet(31/35 Pages) HOLTEK

31 / 35 page

Rev. 1.00

31 of 35

May 27, 2011

32-bit ARM Cortex™-M3 MCU

HT32F1251/51B/52/53

SPI Characteristics

Table 19. SPI Characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fSCK

SCK clock frequency

—

fPCLK/4

MHz

tSCK(H)

SCK clock high time

—

fPCLK/8

—

tSCK(L)

SCK clock low time

—

fPCLK/8

—

SPI Master mode

tV(MO)

Data output valid time

—

tH(MO)

Data output hold time

—

tSU(MI)

Data input setup time

—

tH(MI)

Data input hold time

—

SPI Slave mode

tSU(SEL)

SEL enable setup time

—

4 tPCLK

—

tH(SEL)

SEL enable hold time

—

2 tPCLK

—

tA(SO)

Data output access time

—

3 tPCLK

tDIS(SO)

Data output disable time

—

tV(SO)

Data output valid time

—

tH(SO)

Data output hold time

—

tSU(SI)

Data input setup time

—

tH(SI)

Data input hold time

—

SCK (CPOL = 0)

SCK (CPOL = 1)

MOSI

MISO

MOSI

MISO

tSCK(H)

tSCK(L)

tSCK

DATA VALID

tV(MO)

CPHA = 0

CPHA = 1

tH(MO)

tH(MI)

tSU(MI)

tV(MO)

tH(MO)

tSU(MI)

tH(MI)

DATA VALID

Figure 7. SPI Timing Diagram – SPI Master Mode

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