HT68FU50 datasheet(198/244 Pages) HOLTEK

198 / 244 page

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60

HT68FU30/HT68FU40/HT68FU50/HT68FU60

Rev. 1.50

198

March 15, 2011

that as it takes a certain period of time known as the

System Start-up Time for oscillator to restart and stabi-

lize after a wake-up, any data received during this time

on the RX pin will be ignored.

For a UART wake-up interrupt to occur, in addition to the

bits for the wake-up enable control and Receive inter-

rupt enable control being set, the global interrupt enable

control and the related interrupt enable control bits must

also be set. If these two bits are not set, then only a

wake-up event will occur and no interrupt will be ser-

viced. Note also that as it takes a period of delay after a

wake-up before normal microcontroller resumes, the

relevant UART interrupt will not be serviced until this pe-

riod of delay time has elapsed.

Using the UART Function

To use the UART function, several important steps must

be implemented to ensure that the UART module oper-

ates normally:

· The SPI pin-remapping function must be properly

configured when the SPI functional pins of the

microcontroller are used to control the UART module

and for data transmission and data reception.

To correctly connect the MCU Master SPI to the UART

Module Slave SPI, the SIM pin-remapping settings for

PCK and PINTB in the MCU PRM0 register should be

the same as the values listed in the following table.

¨ HT68FU30

PRM0 Register

- PCK and PINT pin-remap setup

Bit

Name

SIMPS0

PCKPS

Setting value

¨ HT68FU40/HT68FU50

PRM0 Register

- PCK and PINT pin-remap setup

Bit

Name

SIMPS1

SIMPS0

PCKPS

Setting value

¨ HT68FU60

PRM0 Register

- PCK and PINT pin-remap setup

Bit

Name

SIMPS1

SIMPS0

PCKPS

Setting value

· The SIM operating mode control bits SIM2~SIM0, in

the SIMC0 register have to be configured to enable

the SIM to operate in the SPI master mode with a dif-

ferent SPI clock frequency.

¨ SIM operating mode control bits SIM2~SIM0 in the

SIMC0 Register

Bit

Name

SIM2

SIM1

SIM0

value

100, 011, 010, 001 or 000

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

101~111: must not be used

· The PCK control bit is set to 1 to enable the PCK out-

put as the clock source for the UART baud rate gener-

ator with various PCK output frequencies determined

by the PCKP1 and PCKP0 bits in the SIMC0 Register.

¨ PCK output frequency selection bits

PCKP1~PCKP0 in the SIMC0 Register

Bit

Name

PCKP1

PCKP0

Value

11, 10, 01 or 00

00: PCK output frequency is fSYS

01: PCK output frequency is fSYS/4

10: PCK output frequency is fSYS/8

11: PCK output frequency is TM0 CCRP match

frequency/2

¨ PCK output enable control bit PCKEN in the

SIMC0 Register

Bit

Name

PCKEN

Value

0: Disable PCK output

1: Enable PCK output

After the above setup conditions have been imple-

mented, the MCU can enable the SIM interface by set-

ting the SIMEN bit high. The MCU can then begin

communication with external UART connected devices

using its SPI interface. The detailed MCU Master SPI

functional description is provided within the Serial Inter-

face Module section of the MCU datasheet.

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