DSP56F826 Motorola, DSP56F826 Datasheet - Page 15

• Manufacturer Part Number: DSP56F826
• Description: 16-bit Digital Signal Processor
• Manufacturer: Motorola

All inputs have a weak internal pull-up circuit associated with them. These pull-up circuits are always enabled.
Exceptions:
1.
2.
Signal
XTAL
Name
Table 3. DSP56F826 Signal and Package Information for the 100 Pin LQFP
WR
When a pn is owned by GPIO, then the pull-up may be disabled under software control.
TCK has a weak pull-down circuit always active.
Pin No.
27
62
Output
Output
Type
DSP56F826 Preliminary Technical Data
Write Enable—WR is asserted during external memory write cycles. When
WR is asserted low, pins D0–D15 become outputs and the DSP puts data on
the bus. When WR is deasserted high, the external data is latched inside the
external device. When WR is asserted, it qualifies the A0–A15, PS, and DS
pins. WR can be connected directly to the WE pin of a Static RAM.
Crystal Oscillator Output—This output connects the internal crystal
oscillator output to an external crystal. If an external clock source over
4MHz is used, XTAL must be used as the input and EXTAL connected to
V
SS . For more information, please refer to
Description
Section
3.5.2.
Introduction
15