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Bus Controller (BC)
8-66
8.14.3
Software Page Mode
Software page mode is a mode that forcibly initiates page mode by setting the control register.
Operation within software page mode is as described below. Refer to Fig. 8-14-6.
•
When the mode is initiated, the contents of PRAR are output as the row address.
•
While the mode is in effect, RASn for the block corresponding to the memory control register that initiated the
mode is maintained in the asserted state.
•
After the mode is initiated, external accesses are all processed
as column address accesses
. In this case,
the ASC and CAS parameters of the block in question are guaranteed. In addition, the RE/WE signal has the
same waveform as in a normal DRAM access.
•
The CAS precharge interval depends on the timing of the external access. Note that the shortest CAS precharge
interval is ASC + 3 for a read, or ASC + 1 for a write. As an example, Fig. 8-14-6 illustrates the case where the
CAS precharge interval is at its shortest.
•
(CAO + 1) MCLK pulses are guaranteed for the row address output interval. (“CAO” is a parameter.)
•
The parameter ASR for the block in question is guaranteed for the assertion of RASn.
The procedure for executing this mode is described below:
■
Preparation for mode initiation
(1) Set the row address in the row address register PRAR.
Set a row address that has already been shifted according to the DRAM size.
(2) Set DRAMCTR.
Be certain to set the PAGE bit to “1” and the DRAME bit to “1”.
■
Mode initiation
Once the PE bit of the memory control register for the block in question (block 1 or 2) is set to “1”, software
page mode access begins after the register writing operation has been completed.
■
Mode termination
Once the PE bit of the memory control register for the block in question (block 1 or 2) is set to “0”, software
page mode is terminated after the register writing operation has been completed.
Note: When performing ICE trace/emulation in software page mode, set the CAS parameter to “5” or higher.
Summary of Contents for MN103001G/F01K
Page 1: ...MICROCOMPUTER MN1030 MN103001G F01K LSI User s Manual Pub No 23101 050E ...
Page 2: ......
Page 4: ......
Page 6: ......
Page 8: ......
Page 9: ...Table of Contents List of Figures and Tables 0 ...
Page 26: ...xviii ...
Page 27: ...1 0 1 General Specifications ...
Page 35: ...2 CPU 2 ...
Page 57: ...3 Extension Instruction Specifications 3 ...
Page 96: ...Extension Instruction Specifications 3 40 ...
Page 97: ...4 Memory Modes 3 4 ...
Page 102: ...Memory Modes 4 6 ...
Page 103: ...5 Operating Mode 5 ...
Page 107: ...6 Clock Generator 6 13 ...
Page 111: ...7 Internal Memory 7 ...
Page 114: ...Internal Memory 7 4 ...
Page 115: ...8 Bus Controller BC 8 ...
Page 189: ...9 Interrupt Controller 9 ...
Page 220: ...Interrupt Controller 9 32 ...
Page 221: ...10 8 bit Timers 9 10 ...
Page 254: ...8 bit Timers 10 34 ...
Page 255: ...11 16 bit Timers 11 ...
Page 292: ...16 bit Timers 11 38 ...
Page 293: ...12 Watchdog Timer 11 12 ...
Page 302: ...Watchdog Timer 12 10 ...
Page 303: ...13 Serial Interface 13 ...
Page 354: ...Serial Interface 13 52 ...
Page 355: ...14 A D Converter 14 ...
Page 367: ...15 I O Ports 15 ...
Page 431: ...16 Internal Flash Memory 16 ...
Page 439: ...17 17 Ordering Mask ROM ...
Page 442: ...Ordering Mask ROM 17 4 ...
Page 443: ...Appendix ...