System Overview
Am186™CC/CH/CU Microcontrollers User’s Manual
3-33
The Am186CC and Am186CH microcontrollers also include the transmitter/receiver clocks
for each High-level Data Link Control (HDLC) channel.
In the Am186CC microcontroller, each HDLC channel receives its clock inputs directly from
the external communication clock pins (TCLK _X and RCLK_X) in all modes except in GCI
mode. In GCI mode the external GCI communication clocks (TCLK_A and RCLK_A) are
first converted to an internal clocking format (analogous to PCM Highway) before
presentation to the HDLC. The system clock must be at least the same frequency as any
HDLC clock. The Am186CC microcontroller supports the following clock frequencies:
■
HDLC DCE mode supports clocks up to 10 MHz.
■
HDLC PCM mode supports clocks up to 10 MHz.
■
HDLC GCI mode supports a 1.536-MHz clock input. (System clock must be at least
twice the GCI clock.)
In the Am186CH HDLC microcontroller, each HDLC channel receives its clock inputs
directly from the external communication clock pins (TCLK _X and RCLK_X) in all modes.
The system clock must be at least the same frequency as any HDLC clock. The Am186CH
HDLC microcontroller supports the following clock frequencies:
■
HDLC DCE mode supports clocks up to 10 MHz.
■
HDLC PCM mode supports clocks up to 10 MHz.
Figure 3-3
Am186CC/CH/CU Microcontroller Clocks
CH
CC
CC
CH
{CLKSEL2}–{CLKSEL1}
CLKOUT
PLL Bypass Mode
48-MHz
USB Clock
{USBSEL2}–{USBSEL1}
1x
2x
4x
2x
4x
X1
X2
Am186CC/CH/CC Microcontroller
PLL
PLL
USBX1
UXBX2
CPU Clock
CC
CU
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...