668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 59
668-0003-C
Manufacturer Part Number
668-0003-C
Description
IC CPU RABBIT2000 30MHZ 100PQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0003.pdf
(228 pages)
Specifications of 668-0003-C
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 2000 8-Bit
Speed
30MHz
Voltage
2.7V, 3V, 3.3V, 5V
Mounting Type
Surface Mount
Package / Case
100-MQFP, 100-PQFP
Features
-
Other names
316-1004
668-0003
668-0003
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
668-0003-C
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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Chapter 5 Pin Assignments and Functions
Status
Chip
Selects
Output
Enables
Write
Enables
I/O Control /BUFEN
Pin Group
SMODE1
SMODE0
/CS0
/CS1
/CS2
/OE0
/OE1
/WE0
/WE1
Pin Name
Table 5-1. Rabbit Pin Descriptions (continued)
Input
Output
Output
Output
Output
Output
Output
Output
Output
Direction
Startup mode select (SMODE1 = pin 35,
SMODE0 = pin 36) to determine bootstrap
procedure.
(SMODE1 = 0, SMODE0 = 0) start
executing at address zero.
(0,1) cold boot from slave port.
(1,0) cold boot from clocked serial port A.
(1,1) cold boot from asynchronous serial
port A at 2400 bps.
The SMODE pins can be used as general
input pins once the cold boot is complete.
Memory Chip Select 0—connects directly
to static memory chip select pin. Normally
this pin is used to select base flash memory
that holds the program.
Memory Chip Select 1—normally this pin
is connected directly to static RAM chip
select. /CS1 can be optionally forced
continuously low under software control, a
feature that aids in the use of battery-
backed RAM when the chip select must
pass through a controller that may have a
slow propagation time.
Memory Chip Select 2—connect to static
memory chip. Use this chip select last.
Memory Output Enable 0—connect
directly to static memory chip.
Memory Output Enable 1—alternate
memory output enable allows chip selects
to be shared between two memory chips.
Memory Write Enable 0—connect directly
to static memory chip. This pin may be
disabled under software control to write
protect the chip.
Memory Write Enable 1—connect directly
to static memory chip. This pin may be
disabled under software control to write
protect the chip.
I/O Buffer Enable—this signal is driven
low during an external I/O cycle and may
be used to control 3-state enable on the bus
buffer. The purpose is to save power by not
driving the I/O address or data lines on
every bus cycle.
Function
35–36 (1:0)
8
5
4
6
76
69
80
33
Pin Numbers
53
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