參數(shù)資料
型號(hào): M37640E8
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER
中文描述: 單芯片8位CMOS單片機(jī)
文件頁數(shù): 42/172頁
文件大?。?/td> 1193K
代理商: M37640E8
2-30
7/9/98
Input and Output Ports
7600 Series
M37640E8-XXXF Preliminary Specification
Mitsubishi Microcomputers
Port 4
Port 4 is a 5-bit general purpose I/O port that can be configured to access special second functions.
The port can be set up in any configuration in all three processor modes.
Port 4
0
This pin is multiplexed with the EDMA (Extended Data Memory Access) function. When the MCU
is in memory expansion or microprocessor mode and CPMB4 is set to “1”, this pin operates as the
EDMA output as described in section 2.5.7 on page 2-23.
Figure 2-28. Port P4
0
Block Diagram
Port 4
1
- 4
2
These pins are multiplexed with external interrupts 0 and 1 (INT0 and INT1). The external interrupt
function is enabled by setting the bits to “1” in the interrupt control register that correspond to
INT0 and INT1. The interrupt polarity register can be configured to define INT0 and INT1 as active
high or low interrupts. See section 2.8.1 on page 2-43 for more information on configuring
interrupts.
Figure 2-29. Port P4
1
and P4
2
Block Diagram
Port 4
3
- 4
4
These pins are multiplexed with Timer X and Y functions for pin 4
3
and pin 4
4
respectively. The
timer functions of the pins are independently defined by configuring the timer peripheral. Pin 4
3
acts
as Timer X input pin for pulse width measurement mode and event counter mode or as Timer X
output pin for pulse output mode. Pin 4
3
can also be used as an external interrupt (CNTR0) when
Timer X in not in output mode. The polarity is selected in the Timer X mode register. The external
interrupt function is enabled by setting the bit to “1” in the interrupt control register that
Direction Register
Data Bus
Port Latch
CPMB4
EDMA Signal
Direction Register
Data Bus
Port Latch
Interrupt Input
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