UPD75216ACW Description Of Symbols In The Addressing Area Column - NEC

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UPD75216ACW

Manufacturer Part Number
UPD75216ACW
Description
4-BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC
Datasheet
(3)

Description of symbols in the addressing area column

* 1
MB = MBE • MBS
(MBS = 0, 1, 15)
* 2
MB = 0
* 3
MBE = 0 : MB = 0 (00H to 7FH)
MB = 15 (80H to FFH)
MBE = 1 : MB = MBS (MBS = 0, 1, 15)
* 4
MB = 15, fmem = FB0H to FBFH,
FF0H to FFFH
* 5
MB = 15, pmem = FC0H to FFFH
* 6
addr = 0000H to 3F7FH
* 7
addr = (Current PC) – 15 to (Current PC) – 1,
(Current PC) + 2 to (Current PC) + 16
* 8
caddr = 0000H to 0FFFH
1000H to 1FFFH
2000H to 2FFFH
3000H to 3F7FH
* 9
faddr = 0000H to 07FFH
*10
taddr = 0020H to 007FH
Remarks
1.
MB indicates accessible memory bank.
2.
In *2, MB = 0 irrespective of MBE and MBS.
3.
In *4 and *5, MB = 15 irrespective of MBE and MBS.
4.
*6 to *10 indicate addressable areas.
(4)
Description of the machine cycle column
S indicates the number of machine cycles required for skip operation by an instruction having skip function.
The S value varies as follows:
• When not skipped ................................................................................................... S = 0
• When 1-byte or 2-byte instructions are skipped ................................................. S = 1
• When 3-byte instructions are skipped (BR !addr, CALL !addr instruction) ..... S = 2
Note
GETI instruction is skipped in one machine cycle.
One machine cycle is equal to one cycle(=t
according to PCC setting.
36
Program Memory
(PC
= 00B) or
13, 12
(PC
= 01B) or
13, 12
(PC
= 10B) or
13, 12
(PC
= 11B)
13, 12
) of CPU clock
and three time periods are available
CY
PD75216A
Data Memory
Addressing
Addressing

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