System Overview
Am186™CC/CH/CU Microcontrollers User’s Manual
3-19
DRAM
[CAS0]
[CAS1]
MCS2
MCS1
O
Column Address Strobes 0–1: When either the upper or lower
chip select regions are configured for DRAM, these pins provide
the column address strobe signals to the DRAM. The CAS
signals can be used to perform byte writes in a manner similar
to WLB and WHB, respectively, i.e., [CAS0] corresponds to the
low byte (WLB) and [CAS1] corresponds to the high byte (WHB).
[RAS0]
LCS
O
Row Address Strobe 0: When the lower chip select region is
configured to DRAM, this pin provides the row address strobe
signal to the lower DRAM bank.
[RAS1]
[MCS3]
PIO5
O
Row Address Strobe 1: When the upper chip select region is
configured to DRAM, this pin provides the row address strobe
signal to the upper DRAM bank.
INTERRUPTS
INT5–INT0
—
STI
Maskable Interrupt Requests 0–8 indicate to the
microcontroller that an external interrupt request has occurred.
If the individual pin is not masked, the microcontroller transfers
program execution to the location specified by the associated
interrupt vector in the microcontroller’s interrupt vector table.
Interrupt requests are synchronized internally and can be edge-
triggered or level-triggered. The interrupt polarity is
programmable.To guarantee interrupt recognition for edge-
triggered interrupts, the user should hold the interrupt source for
a minimum of five system clocks. A second interrupt from the
same source is not recognized until after an acknowledge of the
first.
The board designer is responsible for properly terminating the
INT8–INT0 inputs.
[INT6]
PIO19
[INT7]
PIO7
[INT8]
[PWD]
PIO6
Table 3-7
Signal Descriptions (Continued)
Signal Name
1
Multiplexed
Signal(s)
Type Description
Содержание Am186 CC
Страница 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Страница 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Страница 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Страница 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Страница 39: ...Architectural Overview Am186 CC CH CU Microcontrollers User s Manual 1 15 Figure 1 6 32 Channel Linecard CH CC...
Страница 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Страница 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Страница 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Страница 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Страница 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...