mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 66

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

External Signals
RSTCONF
PORESET
UPWAITA
UPWAITB
HRESET
SRESET
CLKOUT
EXTCLK
SIGNAL
GPL_A2
GPL_B2
GPL_A3
GPL_B3
GPL_A4
GPL_B4
GPL_A5
EXTAL
XTAL
CS2
CS3
XFC
AS
PIN NUMBER
C15
D14
D11
B13
C12
B3
C5
B5
B4
A4
A5
B2
D1
A6
Table 2-1. Signal Descriptions (Continued)
Freescale Semiconductor, Inc.
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General-Purpose Line 2 on UPMA—This output signal reflects the value specified
in the UPMA in the memory controller when an external transfer to a slave is
controlled by the user programmable machine A (UPMA).
General-Purpose Line 2 on UPMB—This output signal reflects the value specified
in the UPMB in the memory controller when an external transfer to a slave is
controlled by the user programmable machine B (UPMB).
Chip Select 2—This output signal enables a peripheral or memory device at a
programmed address if defined appropriately in the BR2 and OR2 registers of the
memory controller.
General-Purpose Line 3 on UPMA—This output signal reflects the value specified
in the UPMA in the memory controller when an external transfer to a slave is
controlled by the user programmable machine A (UPMA).
General-Purpose Line 3 on UPMB —This output signal reflects the value specified
in the UPMB in the memory controller when an external transfer to a slave is
controlled by the user programmable machine B (UPMB).
Chip Select 3 —This output signal enables a peripheral or memory device at a
programmed address if defined appropriately in the BR3 and OR3 registers of the
memory controller.
General-Purpose Line 4 on UPMA—This output signal reflects the value specified
in the UPMA in the memory controller when an external transfer to a slave is
controlled by the user programmable machine A (UPMA).
User Programmable Machine Wait A—This input signal is sampled when you need
it and when an access to an external slave is controlled by the UPMA in the memory
controller.
Address Strobe—This input pin is driven by an external asynchronous master to
indicate a valid address on the A[6:31] lines. The memory controller in the MPC823
will synchronize this signal and control the memory device addressed if it is
recognized to be under its control.
General-Purpose Line 4 on UPMB —This output signal reflects the value specified
in the UPMB in the memory controller when an external transfer to a slave is
controlled by the user programmable machine B (UPMB).
User Programmable Machine Wait B —This input signal is sampled when you need
it and when an access to an external slave is controlled by the UPMB in the memory
controller.
General-Purpose Line 5 on UPMA —This output signal reflects the value specified
in the UPMA in the memory controller when an external transfer to a slave is
controlled by the user programmable machine A (UPMA). This signal can also be
controlled by the UPMB.
Power-On Reset—When asserted, this input signal causes the MPC823 to enter the
power-on reset state.
Reset Configuration—This input signal is sampled by the MPC823 during the
assertion of the HRESET signal. If it is asserted, the configuration mode is sampled
in the form of the hard reset configuration word driven on the data bus. When this
signal is negated, the default configuration mode is adopted by the MPC823. Notice
that the initial base address of internal registers is determined in this sequence.
Hard Reset —This open drain line, when asserted, causes the MPC823 to enter the
hard reset state.
Soft Reset —This open drain line, when asserted, causes the MPC823 to enter the
soft reset state.
External Crystal —This output signal is one of the connections to an external crystal
for the internal oscillator circuitry.
External Crystal —This signal is one of the connections to an external crystal for the
internal oscillator circuitry.
External Filter Capacitance —This input signal is the connection pin to an external
capacitor filter for the PLL circuitry.
CLKOUT —This output signal is the clock system frequency.
External Clock —This input signal is the external input clock from an external
source.
MPC823 REFERENCE MANUAL
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DESCRIPTION
MOTOROLA