參數(shù)資料
型號(hào): MM912G634CV1AER2
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 193/349頁(yè)
文件大?。?/td> 0K
描述: IC 48KS12 LIN2XLS/HS ISENSE
標(biāo)準(zhǔn)包裝: 2,000
應(yīng)用: 自動(dòng)
核心處理器: HCS12
程序存儲(chǔ)器類型: 閃存(48 kB)
控制器系列: HCS12
RAM 容量: 2K x 8
接口: LIN
電源電壓: 5.5 V ~ 27 V
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP 裸露焊盤
包裝: 帶卷 (TR)
供應(yīng)商設(shè)備封裝: 48-LQFP 裸露焊盤(7x7)
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MM912_634 Advance Information, Rev. 10.0
Freescale Semiconductor
272
The PLLCLK is derived from the VCO clock (with its actual frequency) divided by four until the PLL locks again.
Application software needs to be prepared to deal with the impact of loosing the oscillator status at any time.
5.38.4.6.3
PLL Bypassed External Mode (PBE)
In this mode, the Bus Clock is based on the external oscillator clock. The reference clock for the PLL is based on the external
oscillator. The adaptive spike filter and detection logic can be enabled which uses the VCOCLK to filter and qualify the external
oscillator clock.
The clock sources for COP and RTI can be based on the internal reference clock generator or on the external oscillator clock.
This mode can be entered from default mode PEI by performing the following steps:
1.
Make sure the PLL configuration is valid.
2.
Optionally the adaptive spike filter and detection logic can be enabled by calculating the integer value for the
OSCFIL[4:0] bits and setting the bandwidth (OSCBW) accordingly.
3.
Enable the external Oscillator (OSCE bit)
4.
Wait for the PLL being locked (LOCK = 1) and the oscillator to start-up and additionally being qualified if the Adaptive
Oscillator Filter is enabled (UPOSC=1).
5.
Clear all flags in the CPMUFLG register to be able to detect any status bit change.
6.
Optionally status interrupts can be enabled (CPMUINT register).
7.
Select the Oscillator Clock (OSCCLK) as Bus Clock (PLLSEL=0)
Since the Adaptive Oscillator Filter (adaptive spike filter and detection logic) uses the VCOCLK to continuously filter and qualify
the external oscillator clock, loosing PLL lock status (LOCK=0) means loosing the oscillator status information as well
(UPOSC=0).
The impact of loosing the oscillator status in PBE mode is as follows:
PLLSEL is set automatically and the Bus Clock is switched back to the PLLCLK.
The PLLCLK is derived from the VCO clock (with its actual frequency) divided by four until the PLL locks again.
Application software needs to be prepared to deal with the impact of loosing the oscillator status at any time.
In the PBE mode, not every noise disturbance can be indicated by bits LOCK and UPOSC (both bits are based on the Bus Clock
domain). There are clock disturbances possible, after which UPOSC and LOCK both stay asserted while occasional pauses on
the filtered OSCCLK and resulting Bus Clock occur. The adaptive spike filter is still functional and protects the Bus Clock from
frequency overshoot due to spikes on the external oscillator clock. The filtered OSCCLK and resulting Bus Clock will pause until
the PLL has stabilized again.
5.38.5
Resets
5.38.5.1
General
All reset sources are listed in Table 391. Refer to MCU specification for related vector addresses and priorities
.
5.38.5.2
Description of Reset Operation
Upon detection of any reset of Table 391, an internal circuit drives the RESET pin low for 512 PLLCLK cycles. After 512 PLLCLK
cycles the RESET pin is released. The reset generator of the S12CPMU waits for additional 256 PLLCLK cycles and then
samples the RESET pin to determine the originating source. Table 392 shows which vector will be fetched.
Table 391. Reset Summary
Reset Source
Local Enable
Power-On Reset (POR)
None
Low Voltage Reset (LVR)
None
External pin RESET
None
Illegal Address Reset
None
Clock Monitor Reset
OSCE Bit in CPMUOSC register
COP Reset
CR[2:0] in CPMUCOP register
相關(guān)PDF資料
PDF描述
345-026-527-204 CARDEDGE 26POS DUAL .100 GREEN
345-026-527-202 CARDEDGE 26POS DUAL .100 GREEN
345-026-527-201 CARDEDGE 26POS DUAL .100 GREEN
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