參數(shù)資料
型號(hào): M38K27M4-XXXHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 142/160頁
文件大小: 2177K
代理商: M38K27M4-XXXHP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38K2 Group
81
EXB Operation Timing Diagram
(1) CPU Channel Receiving Operation
CPU channel receiving operation is shown bellow.
Fig. 122 CPU channel receiving operation
Address ExA0
Chip select ExCS
A0 = “1”
CS = “0”
A0 = “1”
CS = “0”
Read ExRD
Write ExWR
Data DQ0 to DQ7
#0
#1
Internal clock
φ
Interrupt request ExINT
[RxB_RDY]
RxB_RDY
Receive buffer full bit RXB_FULL
Receive buffer RXBUF
#0
#1
Transmit buffer TXBUF
CPU channel receive enable bit
RXB_ENB
Receive buffer read
<Initial setting>
External I/O configuration register
INT_CTR[3:1] (P33/ExINT pin control) = 0012 (RxB_RDY interrupt)
<Operation start>
EXB interrupt source enable register
RXB_ENB (CPU channel receive enable) = “1” (Receive buffer full interrupt enabled)
Writing the command for enabling operation makes RXB_RDY assertion and the P33/ExINT pin goes to “L”.
If the CPU channel receive enable bit (RXB_ENB) is “0”, both the receive buffer full bit (RXB_FULL) and the receive buffer ready signal (RxB_RDY) to an
external are inactive.
When a write operation is performed from an external MCU bus in the condition of ExCS = “L” and WxA0 = “H”, it will result in as follows:
The data is written into the receive buffer (RXBUF)
Negation of the receive buffer ready signal (RxB_RDY) to an external is made
The RXB_FULL interrupt is generated.
When the CPU reads out the receive buffer (RXBUF) with an interrupt processing program, the receive buffer full bit (RXB_FULL) is cleared to “0”.
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