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Bus Controller (BC)
8-51
8.13.9
16-bit Bus in Asynchronous Mode and in Address/Data Multiplex Mode
By setting the mode through the MMOD1 and 0 pins and the EXMOD1 and 0 pins, blocks 0 to 3 use multiplex pins
for the memory address and memory data signals (pins ADM15 to 0).
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.
The various parameters for external memory access are set in memory control registers 0 to 3, corresponding to
each block.
Fig. 8-13-23 is the timing chart in the case of a “16-bit bus in asynchronous mode, in address/data multiplex mode.”
As shown in the timing chart, the ADM15 to 0 pins go to “Hi-Z” or the undefined output state while CSn is negated
in address/data multiplex mode. When the bus authority is released, the ADM15 to 0 pins are either pulled up or go
to “Hi-Z”, depending on the setting of the I/O port output mode register.
Note that when writing to byte 0, WE0 is asserted and the data is output on ADM7 to 0, and when writing to byte 1,
WE1 is asserted and the data is output on ADM15 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: For details on the mode settings, refer to Table 8-9-1, “Mode Settings by the BC External Pins.”
Note: “0” (low level) is output on pins A23 to 16 (A23 also serves as CS3) while the ADM15 to 0 pins function as
data pins. Therefore, refer to 3. in section 8.16, “Cautions,” regarding the use of these pins.
Fig. 8-13-23
Access Timing on a 16-bit Bus in Asynchronous Mode and in Address/Data Multiplex
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.”
AS
CSn
ASA
ADE
RWSEL
MCLK
SYSCLK
A23* to 16
ADM15 to 0
RE
WEn
EA
BCE
BCE
ASN
ASA
ADE
ASN
EA
REN
WEN
Read
Write
data in
addr
“0”( )
“L”
addr
addr
data out
addr
: Undefined
: A23 also serves as CS3
*
: Undefined or Hi-Z
“0”( )
“L”
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 ...