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參數(shù)資料
| 型號： | CY7C63742-SC |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 12 MHz, RISC MICROCONTROLLER, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SOIC-24 |
| 文件頁數(shù)： | 9/48頁 |
| 文件大小： | 425K |
| 代理商： | CY7C63742-SC |
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PRELIMINARY
FO R
enCoRe USB CY7C63722/23
CY7C63742/43
17
an enabled GPIO interrupt, wake-up interrupt, SPI slave interrupt, or a LOW state on the D–/SDATA pin will wake the part from
suspend (D– LOW indicates non-idle USB activity). Once one of these resuming conditions occurs, clocks will be restarted and
the device returns to full operation after the oscillator is stable and the selected delay period expires. This delay period is
determined by selection of internal vs. external clock, and by the state of the Ext. Clock Resume Delay as explained in Section 9.0.
Note that executing the DI instruction to turn off all interrupts before suspending can cause an unintended wake-up from a
pending interrupt. To avoid this, any interrupts not intended for waking from suspend should be disabled through the Global
Interrupt Enable Register and the USB End Point Interrupt Enable Register (Section 21.0). In that case executing the DI instruction
is not necessary.
If a resuming condition exists when the suspend bit is set, the part will still go into suspend and then awake after the appropriate
delay time. The Run bit in the Processor Status and Control Register must be set for a part to resume out of suspend.
Once the clock is stable and the delay time has expired, the microcontroller will execute the instruction following the I/O write that
placed the device into suspend mode before servicing any interrupt requests.
To achieve the lowest possible current during suspend mode, all I/O should be held at either VCC or ground. Note that this also
applies to internal port pins that may not be bonded in a particular package. Any unused bits of Ports 0 and 1 should typically be
set to pull-up mode, even if the pins are not present on the package. In addition, the GPIO bit interrupts (Figure 21-4 and Figure
21-5) should be disabled for any pins that are not being used for a wake-up interrupt. This should be done even if the main GPIO
Interrupt Enable (Figure 21-1) is off.
Typical code for entering suspend is shown below:
...
; All GPIO set to low-power state (no floating pins, and bit interrupts disabled unless using for wake-up)
...
; Enable GPIO and/or wake-up timer interrupts if desired for wake-up
...
; Select clock mode for wake-up (see Section 11.1)
mov a, 09h
; Set suspend and run bits
iowr FFh
; Write to Status and Control Register - Enter suspend, wait for GPIO / wake-up interrupt or USB activity
nop
; This executes before any ISR
...
; Remaining code for exiting suspend routine
11.1
Clocking Mode on Wake-up from Suspend
When exiting suspend on a wake-up event, the device can be configured to run in either Internal or External Clock mode. The
mode is selected by the state of the External Oscillator Enable bit in the Clock Configuration Register (Figure 9-2). Using the
Internal Clock saves the external oscillator start-up time and keeps that oscillator off for additional power savings. The external
oscillator mode can be activated when desired, similar to operation at power-up.
The sequence of events for these modes is as follows:
Wake in Internal Clock Mode:
1. Before entering suspend, clear bit 0 of the Clock Configuration Register. This selects Internal clock mode after suspend.
2. Enter suspend mode by setting the suspend bit of the Processor Status and Control Register.
3. After a wake-up event, the internal clock starts immediately (within 2
s).
4. A time-out period of 8
s passes, and then firmware execution begins.
5. At some later point, to activate External Clock mode, set bit 0 of the Clock Configuration Register. This halts the internal clocks
while the external clock becomes stable. After an additional time-out (128
s or 4 ms, see Section 9.0), firmware execution
resumes.
Wake in External Clock Mode:
1. Before entering suspend, the external clock must be selected by setting bit 0 of the Clock Configuration Register. Make sure
this bit is still set when suspend mode is entered. This selects External clock mode after suspend.
2. Enter suspend mode by setting the suspend bit of the Processor Status and Control Register.
3. After a wake-up event, the external oscillator is started. The clock is monitored for stability (this takes approximately 50–100
s with a ceramic resonator).
4. After an additional time-out period (128
s or 4 ms, see Section 9.0), firmware execution resumes.
11.2
Wake-up Timer
The wake-up timer runs whenever the wake-up interrupt is enabled, and is turned off whenever that interrupt is disabled. Operation
is independent of whether the device is in suspend mode or if the global interrupt bit is enabled. Only the wake-up interrupt enable
controls the wake-up timer.
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| CY7C63743C-PXC | 功能描述:輸入/輸出控制器接口集成電路 USB Combo Lo Spd PS/2 Periphrl Cntrlr RoHS:否 制造商:Silicon Labs 產品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
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| CY7C63743C-SXC | 功能描述:輸入/輸出控制器接口集成電路 USB Combo Lo Spd PS/2 Periphrl Cntrlr RoHS:否 制造商:Silicon Labs 產品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| CY7C63743C-SXCT | 功能描述:輸入/輸出控制器接口集成電路 USB/PS/2 Combo LoSpd Peripheral Controlr RoHS:否 制造商:Silicon Labs 產品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
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