UPD78F0886GA(A)-GAM-AX NEC, UPD78F0886GA(A)-GAM-AX Datasheet - Page 72

• Manufacturer Part Number: UPD78F0886GA(A)-GAM-AX
• Description: 8BIT MCU, 60K FLASH, 3KB RAM, CAN
• Manufacturer: NEC

Specifications of UPD78F0886GA(A)-GAM-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 41
• Ram Memory Size: 3KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm Channels: 6
• Digital Ic Case Style: LQFP
• Core Size: 8bit
• Program Memory Size: 60KB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

72
[Instruction format]
[Operation]
[Operand]
[Flag]
[Description]
[Description example]
DEC
• The destination operand (dst) contents are decremented by only one.
• If the decrement result is 0, the Z flag is set (1). In all other cases, the Z flag is cleared (0).
• If the decrement generates a carry for bit 3 out of bit 4, the AC flag is set (1). In all other cases, the AC
• Because this instruction is frequently used for decrement of a counter for repeated operations and an indexed
• If dst is the B or C register or saddr, and it is not desired to change the AC and CY flag contents, the DBNZ
DEC FE92H; The contents at address FE92H are decremented.
flag is cleared (0).
addressing offset register, the CY flag contents are not changed (to hold the CY flag contents in multiple-
byte operation).
instruction can be used.
Mnemonic
Z
×
DEC
AC
×
r
saddr
DEC dst
dst ← dst – 1
CY
Operand(dst)
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
User's Manual U12326EJ4V0UM
Byte Data Decrement
Decrement