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)： 35/172頁
文件大?。?/td> 1193K
代理商： M37640E8
7600 Series
Mitsubishi Microcomputer
M37640E8-XXXF Preliminary Specification
Processor Modes
7/9/98
2-23
2.5.6
Hold Function
The hold function is used when the MCU is put in a system where more than one device will need
control of the external address and data buses. Two signals are used to implement this function, HOLD
(P7
1
) and HLDA (P7
3
). HOLD is an input to the MCU and is brought low when an external device
wants the MCU to relinquish the address and data buses. HLDA is an output from the MCU that
signals when the MCU has relinquished the buses. When this is the case, the MCU tri-state ports 0
and 1 (address bus) and port 2 (data bus), and holds port P3
7
(RD) and port P3
6
(WR) high. Ports
P3
7
and P3
6
are held high to prevent any external device that is enabled by RD or WR from being
falsely activated. The clocks to the CPU are stopped, but the peripheral clocks and port P3
4
(
Φ
out
)
continue to oscillate. HOLD is brought high to allow the MCU to regain the address and data buses.
When this occurs, HLDA will go high and ports P
1
, P
2
, P3
7
and P3
6
will begin to drive the external
buses again. The timing for the hold function is shown in Figure 2-20. The hold function is only valid
for memory expansion and microprocessor modes. Bit 5 of CPMB is used to enable the hold function.
HLDA will loose its function when the IBF
1
pin functionality is used.
Figure 2-20. Hold Mode Timing Diagram
2.5.7
Expanded Data Memory Access
The Expanded Data Memory Access (EDMA) mode feature allows the user to access a greater than 64
Kbyte data area for instructions LDA (IndY) with T = “0” and T = “1”, and STA (IndY). Bit 4 of
CPMB is used to enable/disable the EDMA function. If bit 4 of CPMB equals “1”, then during the
data read/write cycle of instructions LDA (IndY) and STA (IndY) Port 4
0
(EDMA) is driven low. The
EDMA signal output can be used by an external decoder to indicate when the read/write is to a
different 64 Kbyte bank. The actual determination of which bank to access can be done by using a
few bits of a port to represent the extended addresses above AB15. For example, if four banks are
accessed, then two bits are needed to uniquely identify each bank. Two port bits can be used for this,
one representing AB16 and the other AB17. The instruction sequences for STA (IndY) and LDA
(IndY) are shown in Figure 2-21. and Figure 2-22.
X
IN
P1
P2
P1PER
P2PER
Φ
out
RD, WR
ADDR
out
DATA
in/out
HOLD
HLDA
t
su
(HOLD-
Φ
out
)
t
h
(
Φ
out
-HOLD)
t
d
(
Φ
out
-HLDA)
t
d
(
Φ
out
-HLDA)
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