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參數(shù)資料
| 型號： | M68HC16Y1CFC |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, MICROCONTROLLER, PQFP16 |
| 封裝： | QFP-160 |
| 文件頁數(shù)： | 22/138頁 |
| 文件大小： | 784K |
| 代理商： | M68HC16Y1CFC |
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MOTOROLA
MC68HC16Y1
118
MC68HC16Y1TS/D
ASPC — ROM Array Space Field
Because the MC68HC16Y1 operates only in supervisory mode, ASPC determines whether accesses
are restricted solely to program space, or whether accesses are made to both program and data space.
In systems with restricted access levels, ASPC also determines whether accesses are restricted solely
to supervisor space. The reset state of ASPC is user specified. The table below shows ASPC encoding.
WAIT — Wait States Field
WAIT specifies the number of wait states inserted by the MRM during ROM array accesses. It allows
the user to optimize bus speed in a particular application by controlling the number of wait states that
are inserted prior to internal DSACK generation. Each wait state has a duration of one system clock
cycle. This allows a user to transport code from a slower emulation or development system memory to
the ROM array without retiming the system. The reset state of WAIT is user specified. The table below
shows WAIT encoding. A no-wait encoding (%00) corresponds to a three clock-cycle bus. The fast ter-
mination encoding (%11) corresponds to a two clock-cycle bus — microcontroller modules typically re-
spond at this rate, but fast termination can also be used to access fast external memory.
ROMBAH and ROMBAL are used to specify ROM array base address. They can only be written when
STOP = 1 and LOCK = 0. This prevents accidental remapping of the array. Since the states of AD-
DR[23:20] follow the state of ADDR19 in the MC68HC16Y1, addresses in the range $080000 to
$F7FFFF cannot be accessed. Because the 48 Kbyte ROM array in the MC68HC16Y1 must be mapped
to a 64 Kbyte boundary, ROMBAL always contains $0000.
ASPC[1:0]
State Specified
X0
Program and data access
X1
Program access only
WAIT[1:0]
Cycles per Transfer
00
3
01
4
10
5
11
2
ROMBAH — Array Base Address Register High
$YFF824
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
NOT USED
ADDR
23
ADDR
22
ADDR
21
ADDR
20
ADDR
19
ADDR
18
ADDR
17
ADDR
16
RESET:
0
USER SPECIFIED
ROMBAL — Array Base Address Register Low
$YFF826
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET:
0
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