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Bus Controller (BC)
8-29
8.10 Bus Cycle
Depending on the value of the external input pin CKSEL and the internal registers, the MCLK frequency can be
either 1/2, 1, 2, or 4 times the input frequency, and the IOCLK frequency can be either 1/8, 1/4, 1/2, or 1 times the
input frequency. Note that SYSCLK is output with either 1/2 or 1 times the input frequency.
Table 8-10-1
Relationship between the Clock Frequency and
the Number of Cycles (CPU Cycles) Required for Access
CKSEL
H
L
MCK [1:0] =10
MCK [1:0] = 01
MCK [1:0] = 00
(Not using)
4
2
1
1/2
Instruction read
2
2
2
2
Data read
3
3
3
3
Read/write
1
1
1
1
Read
3
3
3
3
Write
2
2
2
2
Internal
Read
Synchronous
7 to 10
7 to 10
7 to 10
7
(*3)
I/O
(*1)
(*3)
Write
Synchronous
6 to 9
6 to 9
6 to 9
6
External
(*2)
Number of EX bus
Number of EX bus
Number of EX bus
Number of EX bus
memory
Read
Synchronous
3 to 6
3 to 4
3
3
Asyn-
Number of EX bus
Number of EX bus
Number of EX bus
Number of EX b
us
chronous
3
3
3
3
(*1)
(*2)
Number of EX bus
Number of EX bus
Number of EX bus
Number of EX bus
Write
Synchronous
2 to 5
2 to 3
2
2
Asyn-
Number of EX bus
Number of EX bus
Number of EX bus
Number of EX bus
chronous
2
2
2
2
(*1)
If the store buffer is operational, the writing to internal I/O and external memory is entirely performed with
0 wait states.
(*2)
In the synchronous mode, a synchronization wait of a maximum of 3 cycles or of 1 cycle is generated when
the MCLK frequency is four times or two times the SYSCLK frequency, respectively.
(*3)
Because the ratio of IOCLK to MCLK is always 1/4, a wait for synchronization is inserted.
Clock control register
MCK [1:0] = 11 is prohibited.
Control
register in
BC
Internal
instruction
ROM/Internal
flash memory
Internal data
RAM
Destination
of access
MCLK/Input
frequency
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 ...