UPD75212ACW View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD75212ACW

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75212A

(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 2F7FH

*7

addr = (Current PC) – 15 to (Current PC) – 1,

(Current PC) + 2 to (Current PC) + 16

*8

caddr = 0000H to 0FFFH (PC13, 12 = 00B) or

1000H to 1FFFH (PC13, 12 = 01B) or

2000H to 2F7FH (PC13, 12 = 10B)

*9

faddr = 0000H to 07FFH

*10

taddr = 0020H to 007FH

Data Memory

Addressing

Program Memory

Addressing

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(=tCY) of CPU clock Φ and three time periods are available

according to PCC setting.

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