EP7312-CB-90 CIRRUS [Cirrus Logic], EP7312-CB-90 Datasheet - Page 10

• Manufacturer Part Number: EP7312-CB-90
• Description: HIGH-PERFORMANCE, LOW-POWER SYSTEM ON CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE
• Manufacturer: CIRRUS [Cirrus Logic]

EP7312
High-Performance, Low-Power System on Chip
DC-to-DC Converter Interface (PWM)
• Provides two 96 kHz clock outputs with
Table 14
assignments.
Timers
• Internal (RTC) timer
• Two internal 16-bit programmable hardware count-
General Purpose Input/Output (GPIO)
• Three 8-bit and one 3-bit GPIO ports
• Supports scanning keyboard matrix
Table 15
Hardware Debug Interface
• Full JTAG boundary scan and Embedded ICE
Table 16
assignments.
10
DRIVE[1:0]
FB[1:0]
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
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
down timers
Note:
support
Pin Mnemonic
Table 15. General Purpose Input/Output Pin Assignments
Table 14. DC-to-DC Converter Interface Pin Assignments
Pin Mnemonic
shows the GPIO pin assignments.
shows the DC-to-DC Converter Interface pin
Pins are multiplexed. See
more information.
shows the Hardware Debug Interface pin
(Note)
(Note)
(Note)
I/O
I/O
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
Table 19 on page 11
PWM drive output
PWM feedback input
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
©
C opyright Cirrus Logic, Inc. 2003
for
®
(All Rights Reserved)
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.
Table 17
• 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
Internal Boot ROM
The internal 128-byte Boot ROM facilitates download of
saved code to the on-board SRAM/FLASH.
Packaging
The EP7312 is available in a 208-pin LQFP package, 256-
ball PBGA package, or a 204-ball TFBGA package.
TCLK
TDI
TDO
nTRST
TMS
PD[0]/LEDFLSH
Note:
Pin Mnemonic
Table 16. Hardware Debug Interface Pin Assignments
Pin Mnemonic
shows the LED Flasher pin assignments.
Pins are multiplexed. See
more information.
Table 17. LED Flasher Pin Assignments
(Note)
I/O
O
I
I
I
I
I/O
O
Table 19 on page 11
JTAG clock
JTAG data input
JTAG data output
JTAG async reset input
JTAG mode select
LED flasher driver
Pin Description
Pin Description
DS508PP5
for