UPD75518 NEC, UPD75518 Datasheet - Page 149

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

(3) Explanation of the symbols in the addressing area field
(4) Explanation of the machine cycle column
Remarks 1. MB indicates an accessible memory bank.
S represents the number of machine cycles required when a skip instruction with the skip function
performs a skip operation. S assumes one of the following values:
• When no skip operation is performed
• When a 1-byte instruction or 2-byte instruction is skipped: S = 1
• When a 3-byte instruction
Caution The GETI instruction is skipped in one machine cycle.
One machine cycle is equal to one cycle of the CPU clock, and three types of times are available for selection
according to the PCC setting.
Note 3-byte instruction: BR !addr, BRA !addr1, CALL !addr, and CALLA !addr1 instructions
*10
*11
*1
*2
*3
*4
*5
*6
*7
*8
*9
2. For *2, MB is always 0 irrespective of MBE and MBS.
3. For *4 and *5, MB is always 15 irrespective of MBE and MBS.
4. *6 to *11 indicate each addressable area.
MB = MBE•MBS
(MBS = 0, 1, 2, 3, or 15)
MB = 0
MBE = 0: MB = 0 (00H-7FH)
MBE = 1: MB = MBS (MBS = 0, 1, 2, 3, or 15)
MB = 15, fmem = FB0H-FBFH or
MB = 15, pmem = FC0H-FFFH
addr = 0000H-3F7FH
addr = (Current PC) - 15 to (Current PC) - 1 or
caddr = 0000H-0FFFH (PC
faddr = 0000H-07FFH
taddr = 0020H-007FH
addr1 = 0000H-7F7FH
(Current PC) + 2 to (Current PC) + 16
1000H-1FFFH (PC
2000H-2FFFH (PC
3000H-3FFFH (PC
4000H-4FFFH (PC
5000H-5F7FH (PC
6000H-6FFFH (PC
7000H-7F7FH (PC
MB = 15 (80H-FFH)
Note
FF0H-FFFH
is skipped
14,13,12
14,13,12
14,13,12
14,13,12
14,13,12
14,13,12
14,13,12
14,13,12
= 000B) or
= 001B) or
= 010B) or
= 011B) or
= 100B) or
= 101B) or
= 110B) or
= 111B)
: S = 2
: S = 0
Data memory
addressing
Program
memory
addressing
PD75518(A)
149