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Bus Controller (BC)
8-35
8.13.2
16-bit Bus with Handshaking, in Synchronous Mode and in Address/Data Separate Mode
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. 8-13-4 is the timing chart in the case of a “16-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. 8-13-5 is the timing chart in the case of a “16-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. 8-13-6 is the timing chart in the case of a “16-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 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".
Note: Setting handshaking is prohibited if synchronous mode has not been set.
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.
Fig. 8-13-4
Access Timing on a 16-bit Bus with Handshaking, 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
WEn
RE
CSn
MCLK
SYSCLK
Dn
DK
EA
REN
DW
BCE
Read
EA
WEN
DW
BCE
Consumed internally
by the BC
Write
DK detection start
DK detection start
: Undefined
Consumed internally by the BC
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 ...