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Bus Controller (BC)
8-39
8.13.4
8-bit Bus with Fixed Wait States, in Synchronous 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.
In synchronous mode, the bus access starts in synchronization with SYSCLK, and when fixed wait states are
inserted, the access ends according to the timing that was set in the memory control register.
The various parameters for external memory access are set in memory control registers 0 to 3, corresponding to
each block.
Fig. 8-13-10 is the timing chart in the case of a half-word access using an “8-bit bus with fixed wait states, in
synchronous mode, in address/data separate mode, and with the frequency of MCLK equal to that of SYSCLK
multiplied by four.”
Fig. 8-13-11 is the timing chart in the case of a half-word access using an “8-bit bus with fixed wait states, in
synchronous mode, in address/data separate mode, and with the frequency of MCLK equal to that of SYSCLK
multiplied by two.”
Fig. 8-13-12 is the timing chart in the case of a half-word access using an “8-bit bus with fixed wait states, in
synchronous mode, in address/data separate mode, and with the frequency of MCLK equal to that of SYSCLK.”
Note that when writing, WE0 is asserted and the data is output on D7 to 0.
Note: For details on the mode settings, refer to Table 8-9-1, “Mode Settings by the BC External Pins.”
Fig. 8-13-10
Access Timing on a 8-bit Bus with Fixed Wait States, in Synchronous 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.”
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
BCS
BCS
BCE
BCS
BCE
BCS
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 ...