Emulator Support
Am186™CC/CH/CU Microcontrollers User’s Manual 4-5
4.3.2.18 S2–S0
The S2–S0 bus indicates the type of memory cycle in progress.
4.3.2.19 S6
The S6 signal is active from t
1
–t
4
on the microcontroller and signals a refresh or DMA
access.
4.3.2.20 SRDY
See “ARDY and SRDY” on page 4-3.
4.3.2.21 UCS
The system typically uses UCS as a FLASH or ROM chip select. Emulators use this to
determine when ROM accesses occur, and can intercept it for overlay memory purposes.
4.3.2.22 {UCSX8} and WLB
During processor reset, the UCSX8 pin configures the upper memory region for 8-bit
operation. The BSIZE8 signal unambiguously indicates the width of a memory region for a
given access.
4.3.2.23 WHB and WR
The emulator can intercept WHB and WR for use with overlay memory. Although most
emulators use S2–S0 to determine cycle type, some may use the WR signal to determine
when writes occur. This prevents the use of WR as a PIO when using the emulator.
4.3.2.24 WLB
4.3.2.25
WR
See “WHB and WR” .
4.3.3 Hardware-Related Considerations
■
Be sure to allow room for pucks and emulator heads on your target board.
■
The following PIO signals are multiplexed with alternate signals that may be used by
emulators: PIO8, PIO15, PIO33, PIO34, and PIO35. Consider any emulator
requirements for the alternate signals before using these pins as PIOs.
4.3.4 Comparison to Other Devices
■
Previous Am186 watchdog timer implementations required the application to disable the
watchdog timer to prevent watchdog time-outs while emulator code was executing. The
Am186CC/CH/CU watchdog timer does not have this limitation. A feature of the
watchdog timer allows ICE code to inhibit the count of the watchdog timer.
4.4 INITIALIZATION
On both external and internal reset, the following occurs:
■
Multiplexed pins used in emulation default to signals shown in Chapter 3, “System
Overview.”
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...