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
Summary of Contents for Am186 CC
Page 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Page 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Page 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Page 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Page 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Page 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Page 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Page 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Page 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...