Figure 12 presents the block diagram of the MC68HC11 C. Port B Port C Control Port D Control Mode Control Interrupt Logic" />
參數(shù)資料
型號: XR88C681P/40
廠商: Exar Corporation
文件頁數(shù): 32/101頁
文件大?。?/td> 0K
描述: IC UART CMOS DUAL 40PDIP
產(chǎn)品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標準包裝: 9
特點: *
通道數(shù): 2,DUART
FIFO's: 1 字節(jié),3 字節(jié)
電源電壓: 4.75 V ~ 5.25 V
帶并行端口:
帶CMOS:
安裝類型: 通孔
封裝/外殼: 40-DIP(0.600",15.24mm)
供應商設備封裝: 40-PDIP
包裝: 管件
XR88C681
36
Rev. 2.11
Figure 12 presents the block diagram of the MC68HC11 C.
Port B
Port C
Control
Port D
Control
Mode Control
Interrupt
Logic
RAM 256 Bytes
Strobe and Handshake Parallel I/O
Oscillator
Clock Logic
A/D Converter
SCI
SPI
Timer
System
Bus Expansion
Address
Address/Data
-IRQ -XIRQ -RESET
CPU Core
E
XTAL EXTAL
MODA
MODB
Port A
Port E
VRH
VRL
8
Figure 12. Block Diagram of the MC68HC11 Microcontroller
S
*
S
C
K
M
O
S
I
M
IS
O
T
X
D
R
X
D
The 68HC11 can be configured to operate in a “Single
Chip” Mode or in an “Expanded Multiplexed Bus” mode. If
a device is configured to operate in the “Single Chip”
mode, the entire 64K bytes of Address space is internal to
the C IC.
Please note that this does not mean that there
is 64K bytes of memory, or other addressable portions
within the device. A 68HC11 MCU configured for “Single
Chip” mode operation cannot address any components
external to the MCU.
Therefore, if a user desired to
interface the DUART to this C, then the C must operate
in the “Expanded-Multiplexed” mode. The MC68HC11 is
configured into the Expanded Multiplexed mode by tying
both the MODA and MODB pin to Vcc, and then resetting
the device.
The MC68HC11 consists of 5 different multi-function
parallel ports. Each of these ports are briefly discussed.
Port A
Port A consists of 3 input pins, 4 output pins and 1
bi-directional pin. This port is used to support the Timer
System. One of the input pins can be used for the Pulse
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