HC08KL8GRSSLASHD datasheet(84/256 Pages) NXP

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System Integration Module (SIM)

General Release Specification

MC68HC08KL8 — Rev. 2.0

System Integration Module (SIM)

8.4.2 Active Resets from Internal Sources

All internal reset sources actively pull the RST pin low for 32 CGMXCLK

cycles to allow resetting of external peripherals. The internal reset signal

IRST continues to be asserted for an additional 32 cycles. (See Figure

8-5.) An internal reset can be caused by an illegal address, illegal

opcode, COP timeout, the USB module, or POR. (See Figure 8-6.) Note

that for POR resets, the SIM cycles through 4096 CGMXCLK cycles

during which the SIM forces the RST pin low. The internal reset signal

then follows the sequence from the falling edge of RST shown in Figure

8-5.

Figure 8-5. Internal Reset Timing

The COP reset is asynchronous to the bus clock.

Figure 8-6. Sources of Internal Reset

The active reset feature allows the part to issue a reset to peripherals

and other chips within a system built around the MCU.

IRST

RST

RST PULLED LOW BY MCU

IAB

32 CYCLES

VECTOR HIGH

CGMXCLK

ILLEGAL ADDRESS RST

ILLEGAL OPCODE RST

COPRST

POR

INTERNAL RESET

USB

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC08KL8GRS/D 데이터시트(PDF) 84 Page - NXP Semiconductors