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Bus Controller (BC)
8-45
8.13.6
8-bit Bus in Asynchronous Mode and in Address/Data Separate Mode
8-bit bus mode is set for block 0 by setting the mode through the MMOD1 and 0 pins and the EXMOD1 and 0 pins,
and for blocks 1 to 3 by setting the BnBW bit to “0” in the corresponding memory control register. In 8-bit bus
mode, half-word access (16 bits) is performed by means of two external accesses, with A[0] = "0" for the low-order
byte and A[0] = "1" for the high-order byte. Word access (32 bits) is performed by means of four accesses, with
A[1:0] = "00", A[1:0] = "01", A[1:0] = "10", and A[1:0] = "11", starting from the low-order side. Note that the low-
order 8 bits (D7 to 0) are used for the data bus.
Asynchronous mode is used for accessing external memory at high speed; the address signals, CS signals, etc., are
output asynchronously with SYSCLK but in synchronization with the internal MCLK. In asynchronous mode,
accesses are all by fixed wait insertion.
Fig. 8-13-16 is the timing chart in the case of a half-word access using an “8-bit bus in asynchronous mode, in
address/data separate mode.”
Note that when writing, WE0 is asserted and the data is output on D7 to 0.
Fig. 8-13-16
Access Timing on a 8-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.”
Note: For details on the mode settings, refer to Table 8-9-1, “Mode Settings by the BC External Pins.”
An
D7-0
WE0
RE
CSn
EA
MCLK
SYSCLK
REN
A[0]=0
A[0]=1
A[0]=0
A[0]=1
EA
REN
EA
WEN
EA
WEN
Read low-
order side
Read high-
order side
Write low-
order side
Write high-
order side
BCE
BCE
BCE
BCE
: Undefined
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 ...