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參數(shù)資料
| 型號： | UPD78320GJ-5BJ |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8-BIT SINGLE-CHIP MICROCONTROLLER |
| 中文描述： | 16/8-BIT單片機(jī) |
| 文件頁數(shù)： | 48/88頁 |
| 文件大?。?/td> | 479K |
| 代理商： | UPD78320GJ-5BJ |
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48
μ
PD78320, 78322
6.
EXTERNAL DEVICE EXPANSION FUNCTION
The
μ
PD78322 can expand external devices (data memory, program memory or peripheral device) for areas (4000H
to FFFFH) except the internal ROM and RAM areas. Tables 6-1 through 6-3 shows the pin used for external device access
and the pin function setting procedure.
Table 6-1. Pin Function Setting (
μ
PD78322)
Memory Expansion
Mode Register
MM0 to MM2
MM7
Fetch Cycle
Control
Register
00H
00H
Except 00H
EA Pin
1
Remarks
0
1
0
1
Port mode
Expansion
mode
General port
Setting prohibited
AD0 to AD7
RD
WR
External device
connection mode
μ
PD71P301
connection mode
Set to A8 to
A15 in steps
Pin Function
P40 to P47
P50 to P57
P90
P91
P92
P93
General-
purpose port
TAS
TMD
For P50 to P57 pins, the number of bits which serve as address buses can be changed according to the externally
expanded memory size. The memory can be expanded in steps from 256 bytes to about 48K bytes. The pins which are
not used as the address bus can be used as the general-purpose input/output port.
Table 6-2. Port and Address Setting for Port 5 (
μ
PD78322)
P57
P56
P55
P54
P53
P52
P51
P50
External Address Space
Port
Port
Port
Port
Port
Port
Port
Port
256 bytes or less
Port
Port
Port
Port
A11
A10
A9
A8
4K bytes or less
Port
Port
A13
A12
A11
A10
A9
A8
16K bytes or less
A15
A14
A13
A12
A11
A10
A9
A8
About 48K bytes or less
Table 6-3. Setting Pin Function (
μ
PD78320)
Memory Expansion
Mode Register
Fetch Cycle
Control
Register
EA Pin
Remarks
External device
connection mode
μ
PD71P301
connection mode
Pin Function
AD0 to AD7
A8 to A15
RD
WR
P92
P93
MM7
μ
PD78322
emulation mode
AD to AD7
A8 to A15
RD
WR
TAS
TMD
00H
Except 00H
0
1
ASTB
0
General-
purpose port
TAS
TMD
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