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Bus Controller (BC)
8-37
An
Dn
WEn
RE
CSn
EA
MCLK
SYSCLK
EA
Read
Write
BCE
BCE
REN
WEN
: Undefined
8.13.3
16-bit Bus in Asynchronous Mode and in Address/Data Separate Mode
Asynchronous mode is used for accessing external memory at high speed; the address signals, CSn signals, etc., are
output asynchronously with the SYSCLK but in synchronization with the internal MCLK. In asynchronous mode,
accesses are all by fixed wait insertion.
Fig. 8-13-7 is the timing chart in the case of a “16-bit bus in asynchronous mode, in address/data separate mode,
and with the frequency of MCLK equal to that of SYSCLK multiplied by four.”
Fig. 8-13-8 is the timing chart in the case of a “16-bit bus in asynchronous mode, in address/data separate mode,
and with the frequency of MCLK equal to that of SYSCLK multiplied by two.”
Fig. 8-13-9 is the timing chart in the case of a “16-bit bus in asynchronous mode, in address/data separate mode,
and with the frequency of MCLK equal to that of SYSCLK.”
During a read, the RE signal is asserted at EA x MCLK after the start of the bus cycle. During a write, the WE
signal is asserted at EA x MCLK after the start of the bus cycle.
Note that when writing to byte 0, WE0 is asserted and the data is output on D7 to 0, and when writing to byte 1,
WE1 is asserted and the data is output on D15 to 8.
In addition, in the case of a word access (32 bits), the external access is performed twice with A[1] = "0" and A[1]
= "1".
Fig. 8-13-7
Access Timing on a 16-bit Bus in Asynchronous Mode and in Address/Data
Separate Mode (MCLK = SYSCLK multiplied by 4)
For details on the various timing settings, refer to the description of the memory control register in section 8.6,
“Description of Registers.”
Содержание MN103001G/F01K
Страница 1: ...MICROCOMPUTER MN1030 MN103001G F01K LSI User s Manual Pub No 23101 050E ...
Страница 2: ......
Страница 4: ......
Страница 6: ......
Страница 7: ...14 A D Converter 15 I O Ports 16 Internal Flash Memory 17 Ordering Mask ROM Appendix 14 15 16 17 ...
Страница 8: ......
Страница 9: ...Table of Contents List of Figures and Tables 0 ...
Страница 26: ...xviii ...
Страница 27: ...1 0 1 General Specifications ...
Страница 35: ...2 CPU 2 ...
Страница 57: ...3 Extension Instruction Specifications 3 ...
Страница 96: ...Extension Instruction Specifications 3 40 ...
Страница 97: ...4 Memory Modes 3 4 ...
Страница 102: ...Memory Modes 4 6 ...
Страница 103: ...5 Operating Mode 5 ...
Страница 107: ...6 Clock Generator 6 13 ...
Страница 111: ...7 Internal Memory 7 ...
Страница 114: ...Internal Memory 7 4 ...
Страница 115: ...8 Bus Controller BC 8 ...
Страница 189: ...9 Interrupt Controller 9 ...
Страница 220: ...Interrupt Controller 9 32 ...
Страница 221: ...10 8 bit Timers 9 10 ...
Страница 254: ...8 bit Timers 10 34 ...
Страница 255: ...11 16 bit Timers 11 ...
Страница 292: ...16 bit Timers 11 38 ...
Страница 293: ...12 Watchdog Timer 11 12 ...
Страница 302: ...Watchdog Timer 12 10 ...
Страница 303: ...13 Serial Interface 13 ...
Страница 354: ...Serial Interface 13 52 ...
Страница 355: ...14 A D Converter 14 ...
Страница 367: ...15 I O Ports 15 ...
Страница 431: ...16 Internal Flash Memory 16 ...
Страница 439: ...17 17 Ordering Mask ROM ...
Страница 442: ...Ordering Mask ROM 17 4 ...
Страница 443: ...Appendix ...