參數(shù)資料
型號(hào)： μPD78F4216Y
廠商： NEC Corp.
英文描述： 8/16 Bit RISC Microcontrollers(8/16位RISC微控制器)
中文描述： 8 / 16位RISC微控制器（8 / 16位的RISC微控制器）
文件頁(yè)數(shù)： 18/56頁(yè)
文件大小： 407K
代理商： ΜPD78F4216Y
18
μ
PD78F4216Y
Preliminary Data Sheet U11824EJ1V0DS00
5. INTERNAL MEMORY SIZE SWITCHING REGISTER (IMS)
The IMS is a register that prevents a part of the internal memory from being used by means of software. By setting
this register, the memory of the
μ
PD78F4216Y can be mapped in the same manner as a mask ROM model with
different internal memory (ROM and RAM) capacity.
This register is set by using an 8-bit memory manipulation instruction.
Its value is set to FFH by RESET input.
Figure 5-1. Format of Internal Memory Size Switching Register (IMS)
Caution IMS is not provided on the mask ROM models (
μ
PD784214Y, 784215Y, and 784216Y).
The value to be set to the IMS to map the memory of the
μ
PD78F4216Y in the same manner as the mask ROM
model is shown in Table 5-1.
Table 5-1. Set Value of Internal Memory Size Switching Register (IMS)
Mask ROM Model
Set Value of IMS
μ
PD784214Y
ECH
μ
PD784215Y
FDH
μ
PD784216Y
FFH
1
1
ROM1
ROM0
1
1
RAM1
RAM0
7
6
5
4
3
2
1
0
ROM1
0
0
1
1
ROM0
0
1
0
1
Selects internal ROM capacity
48 Kbytes
64 Kbytes
96 Kbytes
128 Kbytes
RAM1
0
0
1
1
RAM0
0
1
0
1
Selects peripheral RAM capacity
3072 bytes
4608 bytes
6114 bytes
7680 bytes
Address: 0FFFCH
IMS
At reset: FFH
W
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