參數(shù)資料
型號(hào): DEMO9S08LC60
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 224/360頁(yè)
文件大小: 0K
描述: BOARD DEMO FOR 9S08LC60
產(chǎn)品培訓(xùn)模塊: MC9S08LC60 LCD Microcontroller
標(biāo)準(zhǔn)包裝: 1
類型: MCU
適用于相關(guān)產(chǎn)品: MC9S08LC60
所含物品: 評(píng)估板
產(chǎn)品目錄頁(yè)面: 730 (CN2011-ZH PDF)
相關(guān)產(chǎn)品: MC9S08LC36LK-ND - IC MCU 36K FLASH 2K RAM 80-LQFP
MC9S08LC36LH-ND - IC MCU 36K FLASH 2K RAM 64-LQFP
MC9S08LC60LK-ND - IC MCU 60K FLASH 4K RAM 80-LQFP
MC9S08LC60LH-ND - IC MCU 60K FLASH 4K RAM 64-LQFP
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Chapter 2 Pins and Connections
MC9S08LC60 Series Data Sheet: Technical Data, Rev. 4
30
Freescale Semiconductor
2.3.4
RESET Pin
After POR, the conguration of the PTB2/RESET pin defaults to RESET. Clearing the RSTPE bit in
SOPT1 register congures the pin to be the PTB2 general-purpose, output only pin. After congured as
PTB2, the pin will remain PTB2 until the next reset. The RESET pin can be used to reset the MCU from
an external source when the pin is driven low.
When enabled as the RESET pin (RSTPE = 1), an internal pullup device is automatically enabled. It has
input hysteresis, a high current output driver, and no output slew rate control. Internal power-on reset and
low-voltage reset circuitry typically make external reset circuitry unnecessary.
The PTB2/RESET pin will default to the RESET pin when a POR enters active background mode. This
pin is normally connected to the standard 6-pin background debug connector so a development system can
directly reset the MCU system. If desired, when the pin is congured as the RESET pin, a manual external
reset can be added by supplying a simple switch to ground (pull reset pin low to force a reset).
Whenever any reset is initiated (whether from an external signal or from an internal system), the reset pin
is driven low for approximately 34 cycles of fSelf_reset, released, and sampled again approximately 38
cycles of fSelf_reset later. If reset was caused by an internal source such as low-voltage reset or watchdog
timeout, the circuitry expects the reset pin sample to return a logic 1. The reset circuitry decodes the cause
of reset and records it by setting a corresponding bit in the system control reset status register (SRS).
In EMC-sensitive applications, an external RC lter is recommended on the reset pin. See Figure 2-3 for
an example.
2.3.5
Background / Mode Select (BKGD/MS)
The background / mode select (BKGD/MS) shares its function with an output-only port pin, PTC6. While
in reset, the pin functions as a mode select pin. Immediately after reset rises the pin functions as the
background pin and can be used for background debug communication. While functioning as a
background/mode select pin (BKGDPE = 1), the pin includes an internal pullup device, input hysteresis,
a standard output driver, and no output slew rate control. When used as an I/O port, the pin is limited to
output only.
If nothing is connected to this pin, the MCU will enter normal operating mode at the rising edge of reset.
If a debug system is connected to the 6-pin standard background debug header, it can hold BKGD/MS low
during the rising edge of reset which forces the MCU to active background mode.
The BKGD pin is used primarily for background debug controller (BDC) communications using a custom
protocol that uses 16 clock cycles of the target MCU’s BDC clock per bit time. The target MCU’s BDC
clock could be as fast as the bus clock rate, so there should never be any signicant capacitance connected
to the BKGD/MS pin that could interfere with background serial communications.
Although the BKGD pin is a pseudo open-drain pin, the background debug communication protocol
provides brief, actively driven, high speedup pulses to ensure fast rise times. Small capacitances from
cables and the absolute value of the internal pullup device play almost no role in determining rise and fall
times on the BKGD pin.
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