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Bus Controller (BC)
8-41
8.13.5
8-bit Bus with Handshaking, in Synchronous Mode and in Address/Data Separate Mode
8-bit bus mode is set for blocks 2 and 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.
When using handshaking, bus access starts once synchronization with SYSCLK is achieved, and after the data
acknowledge signal (DK) is asserted, 2 MCLK cycles are consumed by the BC internally and then the access is
completed according to the specified parameters.
The various parameters for external memory access are set in memory control registers 2 and 3, corresponding to
each block.
Handshaking can only be set in synchronous mode.
Fig. 8-13-13 is the timing chart in the case of a half-word access using an “8-bit bus with handshaking, in synchronous
mode, in address/data separate mode, and with the frequency of MCLK equal to that of SYSCLK multiplied by
four.”
Fig. 8-13-14 is the timing chart in the case of a half-word access using an “8-bit bus with handshaking, in synchronous
mode, in address/data separate mode, and with the frequency of MCLK equal to that of SYSCLK multiplied by
two.”
Fig. 8-13-15 is the timing chart in the case of a half-word access using an “8-bit bus with handshaking, in synchronous
mode, in address/data separate mode, and with the frequency of MCLK equal to that of SYSCLK.”
The DK signal connected to the microcontroller should be input so as to be asserted from point EA+DW onward,
and is negated before the next access.
Note that when writing, WE0 is asserted and the data is output on D7 to 0.
Note: If handshaking mode is set for memory block 3, the only settings that are permitted are those in which
MCLK is equal to SYSCLK multiplied by 4. Any setting in which MCLK is only twice SYSCLK, or in
which the two frequencies are equal, is prohibited.
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 ...