參數(shù)資料
型號: M38K29F8LHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 122/151頁
文件大小: 1403K
代理商: M38K29F8LHP
38K2 Group
Rev.3.00
Oct 15, 2006
page 72 of 147
REJ03B0193-0300
(1) External I/O Interface Part
The external I/O interface part consists of a command decoder
and an output selector. A command decoder generates the follow-
ing signals to each unit.
qCPU interface part
CPU channel read (Cch_RD)
CPU channel write (Cch_WR)
qInternal memory interface part
Memory channel read (Mch_RD)
Memory channel write (Mch_WR)
Memory channel terminal count (Mch_TC)
qTransmit/receive data buffer part
Buffer write (Buf_WR)
qExternal I/O interface part
Status selection (stt_sel)
Output enable (ExOE)
Access to the CPU channel can be controlled only by setup of
external signals.
Access to the memory channel can be controlled by the value of
the external I/O configuration register and the state (mRX_enb,
mTX_enb signals) of the internal memory interface part.
The output selector has the function which selects from the state
of CPU channel (TxB_RDY and RxD_RDY) and the state of
memory channel (Mch_req) as the signal assigned to P33/
ExINT pin and P40/ExDREQ/RxD pin.
(2) CPU Interface Part
The CPU interface part consists of the decoder/data selector of
the CPU channel, the CPU write register and CPU channel con-
troller
qDecoder/data selector of CPU channel
A write operation to the CPU register is performed by generating a
write signal for each register with an address decode signal and a
write signal.
A read operation from the CPU register is performed by generat-
ing an output enable signal of the internal data bus with an module
select signal and a read signal and generating a select signal for
each register with an address decode signal.
qCPU write register
There are three CPU write registers as follows:
EXB interrupt source enable register
Index register
External I/O configuration register
The EXB interrupt source register is a read-only register.
A status signal of the CPU channel controller and a status signal
part are generated.
qCPU channel controller
The CPU channel controller generates the following signals, using
bits 0 and 1 (RXB_ENB, TXB_ENB) of EXB interrupt source en-
able register.
Memory channel transmitting buffer control signal (MRD_sel),
generated in the internal memory interface part
CPU channel command signal (Cch_RD, Cch_WR), generated
in the external I/O interface part
Signals RxB_RDY/RxB_full and TxB_RDY/TxB_empty, gener-
ated with read/write signals from the CPU channel
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