參數(shù)資料
型號(hào)： CY7C63310
廠商： Cypress Semiconductor Corp.
英文描述： enCoRe II Low-Speed USB Peripheral Controller(enCoRe II低速USB外設(shè)控制器)
中文描述： enCoRe II還低速USB外設(shè)控制器（enCoRe II還低速的USB外設(shè)控制器）
文件頁(yè)數(shù)： 17/74頁(yè)
文件大?。?/td> 1441K
代理商： CY7C63310
CY7C63310
CY7C638xx
Document 38-08035 Rev. *I
Page 17 of 74
10.0
Clocking
The enCoRe II internal oscillator outputs two frequencies, the
Internal 24 MHz Oscillator and the 32 KHz Low-power Oscil-
lator.
The Internal 24 MHz Oscillator is designed such that it may be
trimmed to an output frequency of 24 MHz over temperature
and voltage variation. With the presence of USB traffic, the
Internal 24 MHz Oscillator can be set to precisely tune to USB
timing requirements (24 MHz ± 1.5%). Without USB traffic, the
Internal 24 MHz Oscillator accuracy is 24 MHz ± 5% (between
0°–70°C). No external components are required to achieve
this level of accuracy.
The internal low-speed oscillator of nominally 32 KHz provides
a slow clock source for the enCoRe II in suspend mode, partic-
ularly to generate a periodic wake-up interrupt and also to
provide a clock to sequential logic during power-up and power-
down events when the main clock is stopped. In addition, this
oscillator can also be used as a clocking source for the Interval
Timer clock (ITMRCLK) and Capture Timer clock (TCAPCLK).
The 32 KHz Low-power Oscillator can operate in low-power
mode or can provide a more accurate clock in normal mode.
The Internal 32 KHz Low-power Oscillator accuracy ranges
(between 0°–70° C) as follows:
5V Normal mode: –8% to + 16%
5V LP mode: +12% to + 48%
3.3V Normal mode: –10% to + 8%
3.3V LP mode: +4% to 35%
When using the 32 KHz oscillator the PITMRL/H registers
must be read until 2 consecutive readings match before
sending/receiving data. The following firmware example
assumes the developer is interested in the lower byte of the
PIT.
Read_PIT_counter:
mov A, reg[PITMRL]
mov [57h], A
mov A, reg[PITMRL]
mov [58h], A
mov [59h], A
mov A, reg[PITMRL]
mov [60h], A
;;;Start comparison
mov A, [60h]
mov X, [59h]
sub A, [59h]
jz done
mov A, [59h]
mov X, [58h]
sub A, [58h]
jz done
mov X, [57h]
;;;correct data is in memory location 57h
done:
mov [57h], X
ret
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CY7C63310-PXC 功能描述:USB 接口集成電路 USB 3K Flash 128 byte RAM COM RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
CY7C63310-SXC 功能描述:USB 接口集成電路 USB Peripheral Cntrl 3K/128 16-SOIC RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
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