參數資料
型號: P90CE201
廠商: NXP Semiconductors N.V.
英文描述: 16-bit microcontroller
中文描述: 16位微控制器
文件頁數: 23/77頁
文件大?。?/td> 235K
代理商: P90CE201
August 1993
23
Philips Semiconductors
Product specification
16-bit microcontroller
P90CE201
6.3
System Control Registers
The P90CE201 has two System Control Registers SYSCON1 and SYSCON2 which allow system parameters to be
selected.
6.3.1
S
YSTEM
C
ONTROL
R
EGISTER
1 (SYSCON1)
Table 10
Description of SYSCON1 bits.
Table 11
Selection of memory access times for ROM and RAM areas.
Notes
1.
2.
1 internal clock cycle contains 2 wait states.
All other states are undefined and reserved.
SYMBOL
BIT
FUNCTION
SYSCON1.15
to
SYSCON1.8
SYSCON1.7
SYSCON1.6
SYSCON1.5
SYSCON1.4
SYSCON1.3
SYSCON1.2
SYSCON1.1
SYSCON1.0
These eight bits are not used.
NROD2
NROD1
NROD0
NRAD2
NRAD1
NRAD0
These three bits select the access time for the ROM area. After a reset operation
these bits are logic 0’s. See Table 11.
not used
not used
These three bits select the access time for the RAM area. After a reset operation
these bits are logic 0’s. See Table 11
NROD2
NROD1
NROD0
ADD WAIT
STATES
f
XTAL
(MHz)
UNIT
NRAD2
NRAD1
NRAD0
24
20
16
12
0
0
0
0
0
0
1
1
0
1
0
1
8
4
2
0
185
101
60
18
235
135
85
35
310
185
122
60
435
268
185
101
ns
ns
ns
ns
Fig.18 System Control Register 1 (SYSCON1).
handbook, full pagewidth
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
bit
NRAD1
NROD2 NROD1 NROD0
NRAD0
NRAD2
MLB011
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