AN2690 Freescale Semiconductor / Motorola, AN2690 Datasheet - Page 8

• Manufacturer Part Number: AN2690
• Description: Low Frequency EEPROM Emulation on the MC68HLC908QY4
• Manufacturer: Freescale Semiconductor / Motorola

AN2690
8
Low Frequency EEPROM Emulation on the MC68HLC908QY4
Freescale Semiconductor, Inc.
For More Information On This Product,
ldhx SP_RAM
txs
ldhx SP_RAM
txs
Go to: www.freescale.com
Figure 3. Method 2 — Recovering from Reset
rts
Restore Original Stack pointer from
Restore registers from STACK
Get SP from RAM and adjust.
Other required Initialization
Return to original program
Switch to XTAL Oscillator
N
(Application specific)
EEPROM Emulation
Internal Reset
Forced Reset
(AN2346)
Detected
Wait?
RAM
Y
ILOP && Forced
RST code
detected.
Delay approx 125ms for
32KHz osc (4096 cycles)
MOTOROLA