Serial Communications Overview
12-2
Am186™CC/CH/CU Microcontrollers User’s Manual
12.2
SYSTEM DESIGN
12.2.1
Multiplexed Signals
The serial interfaces in the Am186CC/CH/CU microcontrollers are multiplexed as shown
in Table 12-1. Because of the multiplexing, there are some design trade-offs, as shown in
the table. The figures that follow the table show how the microcontroller’s serial
communications features could be used in typical applications.
Table 12-1
Multiplexed Signal Trade-Offs for Serial Interfaces
Function Used
Functions Lost
Inter-
face
Name
Pin
Inter-
face
Name
Inter-
face
Name
Inter-
face
Name
Inter-
face
Name
Synchronous Communications Interfaces
DCE
Channel
A
DCE_RXD_A
118
PCM
Channel
A
PCM_RXD_A
—
—
GCI
Channel
A
GCI_DD_A
PIO
—
DCE_TXD_A
119
PCM_TXD_A
—
—
GCI_DU_A
—
DCE_RCLK_A
117
PCM_CLK_A
—
—
GCI_DCL_A
—
DCE_TCLK_A
116
PCM_FSC_A
—
—
GCI_FSC_A
—
DCE_CTS_A
123
PCM_TSC_A
—
—
—
PIO17
DCE_RTR_A
122
—
—
—
—
PIO18
DCE
Channel
B
DCE_RXD_B
138
PCM
Channel
B
PCM_RXD_B
—
—
—
—
PIO
PIO36
DCE_TXD_B
139
PCM_TXD_B
—
—
—
—
PIO37
DCE_RCLK_B
135
PCM_CLK_B
—
—
—
—
PIO40
DCE_TCLK_B
134
PCM_FSC_B
—
—
—
—
PIO41
DCE_CTS_B
137
PCM_TSC_B
—
—
—
—
PIO38
DCE_RTR_B
136
—
—
—
—
—
PIO39
DCE
Channel
C
DCE_RXD_C
153
PCM
Channel
C
PCM_RXD_C
—
—
GCI to
PCM
Con-
version
—
PIO
PIO42
DCE_TXD_C
154
PCM_TXD_C
—
—
—
PIO43
DCE_RCLK_C
150
PCM_CLK_C
—
—
PCM_CLK_C
PIO22
DCE_TCLK_C
149
PCM_FSC_C
—
—
PCM_FSC_C
PIO23
DCE_CTS_C
152
PCM_TSC_C
—
—
—
PIO44
DCE_RTR_C
151
—
—
—
—
PIO45
DCE
Channel
D
DCE_RXD_D
158
PCM
Channel
D
PCM_RXD_D
Low-
Speed
UART
RXD_U
High-
Speed
UART
(Flow
Control)
PIO
PIO26
DCE_TXD_D
159
PCM_TXD_D
TXD_U
PIO20
DCE_RCLK_D
156
PCM_CLK_D
RTR_U
PIO25
DCE_TCLK_D
157
PCM_FSC_D
CTS_U
PIO24
DCE_CTS_D
24
PCM_TSC_D
—
CTS_HU
PIO46
DCE_RTR_D
23
—
—
RTR_HU
PIO47
PCM
Channel
A
PCM_RXD_A
118
DCE
Channel
A
DCE_RXD_A
—
—
GCI
Channel
A
GCI_DD_A
PIO
—
PCM_TXD_A
119
DCE_TXD_A
—
—
GCI_DU_A
—
PCM_CLK_A
117
DCE_RCLK_A
—
—
GCI_DCL_A
—
PCM_FSC_A
116
DCE_TCLK_A
—
—
GCI_FSC_A
—
PCM_TSC_A
123
DCE_CTS_A
—
—
—
PIO17
PCM
Channel
B
PCM_RXD_B
138
DCE
Channel
B
DCE_RXD_B
—
—
—
—
PIO
PIO36
PCM_TXD_B
139
DCE_TXD_B
—
—
—
—
PIO37
PCM_CLK_B
135
DCE_RCLK_B
—
—
—
—
PIO40
PCM_FSC_B
134
DCE_TCLK_B
—
—
—
—
PIO41
PCM_TSC_B
137
DCE_CTS_B
—
—
—
—
PIO38
PCM
Channel
C
PCM_RXD_C
153
DCE
Channel
C
DCE_RXD_C
—
—
GCI to
PCM
Con-
version
—
PIO
PIO42
PCM_TXD_C
154
DCE_TXD_C
—
—
—
PIO43
PCM_CLK_C
150
DCE_RCLK_C
—
—
PCM_CLK_C
PIO22
PCM_FSC_C
149
DCE_TCLK_C
—
—
PCM_FSC_C
PIO23
PCM_TSC_C
152
DCE_CTS_C
—
—
—
PIO44
CC
CH
CC
CH
CC
CC
CH
CC
CH
CC
CC
CC
CC
CC
CC
CH
CC
CH
CC
CC
CH
CC
CH
CC
CC
CC
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...