I don't know about the O/P's situtatoin, or why he thinks a resistor is at all required in order to use an external crystal oscillator with the DS89C4x0 series, but mine don't have a resistor. The driven (input) pin is X1, and X2 serves as an output which is left unconnected.

The datasheet (Aug of '05) says,"

Address Latch Enable. This signal functions as a clock to latch the external address LSB from the multiplexed address/data bus on Port 0. This signal is commonly connected to the latch enable of an external 373-family transparent latch. In default mode, ALE has a pulse width of 1.5 XTAL1 cycles and a period of four XTAL1 cycles. In page mode, the ALE pulse width is altered according to the page mode selection. In traditional 8051 mode, ALE is high when using the EMI reduction mode and during a reset condition. ALE can be enabled by writing ALEON = 1 (PMR.2). Note that ALE operates independently of ALEON during external memory accesses. As an alternate mode, this pin (PROG) is used to execute the parallel program function."

it also says, "For EMI-sensitive applications, the microcontroller can disable the ALE signal when the processor is not accessing external memory."

This implies (a) that the O/P had best be aware that he can disable ALE on internal cycles, but has to make this happen, and, (b) should see ALE on external memory bus access cycles.

RE