參數(shù)資料
型號: M38K27M4L-XXXFP
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: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 121/151頁
文件大小: 1403K
代理商: M38K27M4L-XXXFP
38K2 Group
Rev.3.00
Oct 15, 2006
page 71 of 147
REJ03B0193-0300
EXB Block Diagram
The block diagram of external bus interface (EXB) is shown below.
The external bus interface (EXB) consists of:
(1) External I/O interface part
(2) CPU interface part
(3) Internal memory interface part
(4) Transmit/Receive data buffer part
External I/O interface
CPU interface
Index register
External I/O
configuration
register
EXB interrupt
source enable register
Cch_WR
External MCU bus
Cch_RD
P34/ExCS
CPU channel
TxB_RDY
controller
RxB_RDY
P37/ExA0
P36/ExRD
Memory channel
control
Memory channel
operation mode register
Memory channel
transmit buffer control
Transmit buffer register
Receive buffer register
Memory channel
controller
End address register
Memory address
counter
Memory channel
status
P35/ExWR
Mch_RD
Mch_WR
Mch_TC
P41/ExDACK/TxD
mRX_enb
P42/ExTC/SCLK
mTX_enb
P43/ExA1/SRDY
Memory address
Request acknowledge
Memory read data
Memory write data
P33/ExINT
Mch_req
P40/ExDREQ/RxD
FIFO_stt
MRDsel
stt_sel
Buf_WR
Transmit/Receive data
buffer
ExOE
P10/DQ0/AN0
P17/DQ7/AN7
Multichannel
RAM
Command
decoder
Output
selector
Decoder data selector
Configuration
signal
Internal memory
interface
: Functions as normal ports just after reset.
Fig. 106 Block diagram of external bus interface (EXB)
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