HT68FU50 datasheet(140/244 Pages) HOLTEK

140 / 244 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

HT68FU30/HT68FU40/HT68FU50/HT68FU60

Rev. 1.50

140

March 15, 2011

There are also two control registers for the SPI interface, SIMC0 and SIMC2. Note that the SIMC2 register also has

the name SIMA which is used by the I

2C function. The SIMC1 register is not used by the SPI function, only by the I2C

function. Register SIMC0 is used to control the enable/disable function and to set the data transmission clock fre-

quency. Although not connected with the SPI function, the SIMC0 register is also used to control the Peripheral Clock

Prescaler. Register SIMC2 is used for other control functions such as LSB/MSB selection, write collision flag etc.

· SIMC0 Register

Bit

76543210

Name

SIM2

SIM1

SIM0

PCKEN

PCKP1

PCKP0

SIMEN

R/W

POR

1110000

Bit 7~5

SIM2, SIM1, SIM0: SIM Operating Mode Control

000: SPI master mode; SPI clock is fSYS/4

001: SPI master mode; SPI clock is fSYS/16

010: SPI master mode; SPI clock is fSYS/64

011: SPI master mode; SPI clock is fTBC

100: SPI master mode; SPI clock is TM0 CCRP match frequency/2

101: SPI slave mode

110: I

2C slave mode

111: Unused mode

These bits setup the overall operating mode of the SIM function. As well as selecting if the I

or SPI function, they are used to control the SPI Master/Slave selection and the SPI Master clock

frequency. The SPI clock is a function of the system clock but can also be chosen to be sourced

from the TM0. If the SPI Slave Mode is selected then the clock will be supplied by an external

Master device.

Bit 4

PCKEN: PCK Output Pin Control

0: Disable

1: Enable

Bit 3~2

PCKP1, PCKP0: Select PCK output pin frequency

00: fSYS

01: fSYS/4

10: fSYS/8

11: TM0 CCRP match frequency/2

Bit 1

SIMEN: SIM Control

0: Disable

1: Enable

The bit is the overall on/off control for the SIM interface. When the SIMEN bit is cleared to zero

to disable the SIM interface, the SDI, SDO, SCK and SCS, or SDA and SCL lines will be in a

floating condition and the SIM operating current will be reduced to a minimum value. When the bit

is high the SIM interface is enabled. The SIM configuration option must have first enabled the

SIM interface for this bit to be effective. If the SIM is configured to operate as an SPI interface via

the SIM2~SIM0 bits, the contents of the SPI control registers will remain at the previous settings

when the SIMEN bit changes from low to high and should therefore be first initialised by the

application program. If the SIM is configured to operate as an I

2C interface via the SIM2~SIM0

bits and the SIMEN bit changes from low to high, the contents of the I

2C control bits such as HTX

and TXAK will remain at the previous settings and should therefore be first initialised by the

application program while the relevant I

2C flags such as HCF, HAAS, HBB, SRW and RXAK will

be set to their default states.

Bit 0

unimplemented, read as

²0²

HT68FU50 数据表(PDF) 140 Page - Holtek Semiconductor Inc

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