Chip Selects
5-12
Am186™CC/CH/CU Microcontrollers User’s Manual
■
The value of the MMCS register is set to 7FDBh and the MPCS register is set to 8183h,
which defaults MCS3–MCS0 each to 2 Kbytes with a total MCS block size of 8 Kbytes
at a base address of 3Fh, with external ready, and three wait states. However, the MCS
chip selects are not enabled until software writes to both the MMCS and MPCS registers.
■
Data bus widths are set as follows:
– LCS is 16 bits wide.
– Non-UCS and non-LCS memory (MCS, PCS, and the remaining memory that does
not reside in one of the enabled, memory chip-select regions) accesses are 16 bits
wide.
– All I/O accesses are 16 bits wide.
■
UCS is the inverse of the state of the UCSX8 that was latched on exiting external reset.
If UCSX8 is 0, UCS is 8 bits wide; if UCSX8 is 1, UCS is 16 bits wide. In either case,
UCS defaults to non-DRAM.
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...