ep7309 Cirrus Logic, Inc., ep7309 Datasheet - Page 9

• Manufacturer Part Number: ep7309
• Description: Ep7309 Data Sheet
• Manufacturer: Cirrus Logic, Inc.

PLL and Clocking
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DC-to-DC converter interface (PWM)
•
Timers
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•
General Purpose Input/Output (GPIO)
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DS507F1
DRIVE[1:0]
FB[1:0]
MOSCIN
MOSCOUT
VDDOSC
VSSOSC
Processor and Peripheral Clocks operate from a single
3.6864 MHz crystal or external 13 MHz clock
Programmable clock speeds allow the peripheral bus to run
at 18 MHz when the processor is set to 18 MHz and at
36 MHz when the processor is set to 36, 49 or 74 MHz
Provides two 96 kHz clock outputs with programmable
duty ratio (from 1-in-16 to 15-in-16) that can be used to
drive a positive or negative DC to DC converter
Internal (RTC) timer
Two internal 16-bit programmable hardware count-down
timers
Three 8-bit and one 3-bit GPIO ports
Supports scanning keyboard matrix
RTCIN
RTCOUT
VDDRTC
VSSRTC
Pin Mnemonic
Table 13. DC-to-DC Converter Interface Pin Assignments
Pin Mnemonic
Pin Mnemonic
Table 12. PLL and Clocking Pin Assignments
Table 11. Real-Time Clock Pin Assignments
Main Oscillator Power
Main Oscillator Input
Main Oscillator Output
Main Oscillator Ground
Real-Time Clock Oscillator Input
Real-Time Clock Oscillator Output
Real-Time Clock Oscillator Power
Real-Time Clock Oscillator Ground
I/O
I/O
I
PWM drive output
PWM feedback input
Pin Description
Pin Description
Pin Description
©
Copyright Cirrus Logic, Inc. 2005
(All Rights Reserved)
Hardware debug Interface
•
LED Flasher
A dedicated LED flasher module can be used to generate a low
frequency signal on Port D pin 0 for the purpose of blinking an
LED without CPU intervention. The LED flasher feature is
ideal as a visual annunciator in battery powered applications,
such as a voice mail indicator on a portable phone or an
appointment reminder on a PDA.
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•
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PA[7:0]
PB[7:0]
PD[0]/LEDFLSH
PD[5:1]
PD[7:6]/SDQM[1:0]
PE[1:0]/BOOTSEL[1:0] (Note)
PE[2]/CLKSEL
TCLK
TDI
TDO
nTRST
TMS
PD[0]/LEDFLSH
Note:
Full JTAG boundary scan and Embedded ICE
Software adjustable flash period and duty cycle
Operates from 32 kHz RTC clock
Will continue to flash in IDLE and STANDBY states
4 mA drive current
Note:
Pin Mnemonic
Table 14. General Purpose Input/Output Pin Assignments
Table 15. Hardware Debug Interface Pin Assignments
Pin Mnemonic
Pin Mnemonic
Pins are multiplexed. See
more information.
Pins are multiplexed. See
more information.
High-Performance, Low-Power System on Chip
Table 16. LED Flasher Pin Assignments
(Note)
(Note)
(Note)
(Note)
I/O
O
I
I
I
I
I/O
I/O
O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
Table 18 on page 10
Table 18 on page 10
JTAG clock
JTAG data input
JTAG data output
JTAG async reset input
JTAG mode select
LED flasher driver
GPIO port A
GPIO port B
GPIO port D
GPIO port D
GPIO port D
GPIO port E
GPIO port E
Pin Description
Pin Description
Pin Description
®
support
for
for
EP7309
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