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參數(shù)資料
| 型號： | 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)： | 31/172頁 |
| 文件大小： | 1193K |
| 代理商： | M37640E8 |
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7600 Series
Mitsubishi Microcomputer
M37640E8-XXXF Preliminary Specification
Processor Modes
7/9/98
2-19
2.5.5
Slow Memory Wait
The wait function is used when interfacing with external memories that are too slow to operate at the
normal read/write speed of the MCU. When this is the case, a wait can be used to extend the read/
write cycle. Three different wait modes are supported; software wait, RDY wait, and extended RDY
wait. The appropriate mode is chosen by the setting of bits 0 to 3 of CPMB. The wait function is
disabled for internal memory and is valid only for memory expansion and microprocessor modes.
Software wait is used to extend the read/write cycle by one, two, or three cycles. The cycle number is
determined by the value of bits 0 and 1 of the CPMB. When software wait is selected, the value on
the RDY pin is ignored. The timing for software wait is shown in Figure 2-17.
RDY wait is also used to extend the read/write cycle by one, two, or three cycles. In this case, the
read/write cycle is extended if the RDY pin is low a specific amount of time prior to
Φ
out
going low
at the beginning of the read/write cycle. The extension time is fixed by the value of bits 0 and 1 of
CPMB and does not depend on the state of the RDY pin when the read/write cycle has begun. If the
RDY pin is high at the specified time prior to
Φ
out going low at the beginning of the read/write
cycle, the cycle is not extended. The timing for RDY wait is shown in Figure 2-18..
The extended RDY wait mode is used to extend the read/write cycle by one, two, or three cycles, and
then by an additional amount, dependent on the state of the RDY pin. In this mode, initial extension is
identical to that of the RDY wait. The state of the RDY pin is checked a specific amount of time
prior to the completion of the first cycle of the read/write extension. If the RDY pin is low, the
extension is re-initiated from the time that
Φ
out goes low at the end of the first cycle of the read/
write extension. The RDY pin continues to be checked until it is brought high. When the RDY pin is
brought high, the wait is no longer re-initiated when
Φ
out goes low, and the read/write cycle completes
in one, two, or three cycles, dependent on the value in bits 0 and 1 of CPMB. The timing for this
mode is shown in Figure 2-19.
The wait function can only be enabled for external memory access in microprocessor or memory
expansion modes. However, the wait function can not be enabled for accesses to addresses 0008
16
to
000F
16
(port 0 through port 3 direction registers) in these modes, even though the locations are mapped
as external memory.
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