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HT82A525R Arkusz danych(PDF) 43 Page - Holtek Semiconductor Inc

Numer części HT82A525R
Szczegółowy opis  I/O Type USB 8-Bit OTP MCU with SPI
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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There is a system clock control register implemented to select the clock used in the MCU. This
register consists of USB clock control bit (USBCKEN), second suspend mode control bit (SUSP2)
and system clock selection (SYSCLK).
If HIRC oscillator is used and for USB mode should enable CLK_adj bit for PSD register to adjust
system clock for temperature.
The following table defines which endpoint FIFO is selected, EPS2, EPS1 and EPS0.
Bit No.
Label
R/W
Function
0
1
2
EPS0
EPS1
EPS2
R/W
Accessing endpoint FIFO selection.
EPS2, EPS1, EPS0:
000: Select endpoint 0 FIFO
001: Select endpoint 1 FIFO
010: Select endpoint 2 FIFO
011: Select endpoint 3 FIFO
100: Reserved for future expansion, cannot be used
101: Reserved for future expansion, cannot be used
110: Reserved for future expansion, cannot be used
111: Reserved for future expansion, cannot be used
If the selected endpoints do not exist, the related functions are not available.
3
USBCKEN R/W
USB clock Control bit
0: disable
1: enable
4
SUSP2
R/W
Suspend mode control bit
0: Normal Mode
1: HALT Mode
This bit is used to reduce power consumption in suspend mode. In normal mode, clear
this bit to
²0². In HALT mode, set this bit to ²1² to reduce power consumption.
5
¾¾ Unused bit, read as ²0²
6
SYSCLK
R/W
System clock oscillator frequency control bit
0: 12MHz
1: 6MHz
This bit is used to specify the system clock oscillator frequency used by the MCU. If a
6MHz crystal oscillator or resonator is used, this bit should be set to
²1². If a 12MHz
crystal oscillator or resonator is used, this bit should be cleared to
²0² .
7
RCtrl
R/W
7.5k
W resistor between USBDP and Vbus select bit
0: without resistor
1: with resistor
UCC (22H) Definitions
The AWR register contains the current address and the remote wake-up function control bit. The ini-
tial value of the AWR is
²000H²0. The address value extracted from the USB command is not to be
loaded into this register until the SETUP stage is finished.
Bit No.
Label
R/W
Function
0
WKEN
R/W
Remote wake-up enable/disable
0: disable
1: enable
1~7
AD0~AD6
R/W
USB device address
AWR (23H) Definitions
Rev. 1.80
43
March 11, 2016
HT82A525R
I/O Type USB 8-Bit OTP MCU with SPI


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