参数资料
型号: MC68HC901FNR2
厂商: MOTOROLA INC
元件分类: 外设及接口
英文描述: MULTIFUNCTION PERIPHERAL, PQCC52
封装: PLASTIC, LCC-52
文件页数: 10/73页
文件大小: 274K
代理商: MC68HC901FNR2
Signal Description
2-5
MC68HC901 USER’S MANUAL
MOTOROLA
2.10.2 Serial Output (SO)
This output line is the USART transmitter data output. This output is in a high-impedance
state after a device reset.
2.10.3 Receiver Clock (RC)
This input controls the serial bit rate of the receiver. The signal may be supplied by the timer
output lines or by an external TTL-level clock which meets the minimum and maximum cycle
times. This clock is not used in the USART loopback mode. Refer to Section 7.3.2
Transmitter Status Register for additional information.
2.10.4 Transmitter Clock (TC)
This input controls the serial bit rate of the transmitter. This signal may be supplied by the
timer output lines or by an external TTL-level clock which meets the minimum and maximum
cycle times.
2.11 DIRECT MEMORY ACCESS CONTROL
The USART section of the MFP supports direct memory access transfers through its
receiver ready and transmitter ready status lines.
2.11.1 Receiver Ready (RR)
This active low output reflects the receiver buffer full status (bit 7 in the Receiver Status
Register) for DMA operations.
2.11.2 Transmitter Ready (TR)
This active low output reflects the transmitter buffer empty (bit 7 in the Transmitter Status
Register) for DMA operations.
2.12 SIGNAL SUMMARY
The following table is a summary of all the signals discussed in the previous paragraphs.
Table 2-1. Signal Summary
SIGNAL NAME
MNEMONIC
INPUT/
OUTPUT
ACTIVE
STATE
THREE-
STATE
RESET
STATE
Power Input
VCC
Input
High
Ground
GND
Input
Low
Clock
CLK
Input
N / A
Chip Select
CS
Input
Low
Data Strobe
DS
Input
Low
Read / Write
R / W
Input
Read – High,
Write – Low
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