参数资料
型号: M38K29F8LHP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封装: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件页数: 5/126页
文件大小: 2167K
代理商: M38K29F8LHP
1-83
38K2 Group User’s Manual
HARDWARE
FUNCTIONAL DESCRIPTION
(2) CPU Channel Transmitting Operation
CPU channel transmitting operation is shown bellow.
Fig. 123 CPU channel tranmitting operation
#0
#1
TxB_RDY
#0
#1
Address ExA0
Chip select ExCS
Read ExRD
Write ExWR
Data DQ0 to DQ7
Internal clock
φ
Interrupt request ExINT
[TxB_RDY]
Transmit buffer empty bit
TXB_EMPTY
Receive buffer RXBUF
Transmit buffer TXBUF
CPU channel transmit enable bit
TXB_ENB
Transmit data write
<Initial setting>
External I/O configuration register
INT_CTR[3:1] (P33/ExINT pin control) = 0102 (TxB_RDY interrupt)
<Operation start>
EXB interrupt source enable register
TXB_ENB (CPU channel transmit enable) = “1” (Transmit buffer empty interrupt enabled)
Writing the command for enabling operation generates TXB_EMPTY interrupt.
If the CPU channel transmit enable bit (TXB_ENB) is “0”, both the transmit buffer empty bit (TXB_EMPTY) and the transmit buffer ready signal (TxB_RDY) to
an external are inactive.
When the CPU writes the data into the transmit buffer (TXBUF) with an interrupt processing program, the transmit buffer empty bit (TXB_EMPTY) is cleared
to “0” and assertion of the transmit buffer ready signal (TxB_RDY) to an external is made.
When a read operation is performed from an external MCU bus in the condition of ExCS = “L” and ExA0 = “H”, it will result in as follows:
The contents of the transmit buffer (TXBUF) is read out
The transmit buffer empty bit (TXB_EMPTY) is set to “1”
Negation of the transmit buffer ready signal (TxB_RDY) to an external is made.
A0 = “1”
CS = “0”
A0 = “1”
CS = “0”
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