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HT82A525R Arkusz danych(PDF) 43 Page - Holtek Semiconductor Inc |
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HT82A525R Arkusz danych(HTML) 43 Page - Holtek Semiconductor Inc |
43 / 71 page 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 |
Podobny numer części - HT82A525R_16 |
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Podobny opis - HT82A525R_16 |
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