LCE-780308-EM Renesas Electronics America, LCE-780308-EM Datasheet - Page 13

• Manufacturer Part Number: LCE-780308-EM
• Description: BOARD EMULATOR 78K0 UPD780308
• Manufacturer: Renesas Electronics America

Specifications of LCE-780308-EM

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LCE-780308-EM User’s Manual
2.5. Using P07/XT1 As Input From Probe
The devices emulated by the LCE-780308-EM board have an input pin named P07/XT1
(or XT1/P07). This pin can be used either as a parallel input, read as bit 7 of port P0, or
as the XT1 subclock source.
The ID78K0-LCE program has a Mask Option setting for port P07/XT1, setting it as
either P07 (input port) or XT1 (subclock). This option setting has no effect. The actual
probe pin for P07/XT1 can be used as either P07 or XT1 regardless of the Mask Option
setting.
However, the LCE-78K0 motherboard does have an option allowing either a standard on-
board 32KHz clock, or the input from the probe pin P07/XT1, to be supplied to the
P07/XT1 input of the peripheral emulator device. In order to use the probe input as either
P07 or XT1, the ID78K0-LCE configuration dialog must have the Subclock option set to
“User”, rather than “32KHz”.
Figure 2.5-1 ID78K0-LCE Configuration Dialog Box
When the “32 KHz” option is selected in the Configuration dialog, the on-board 32 KHz
clock source is connected to P07/XT1. Reading port P0 in this configuration will result
in an indeterminate value for bit 7.
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