455A Datasheet, PDF (53/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

455A Group
• Key-on wakeup control register K0
• Key-on wakeup control register K1
• Key-on wakeup control register K2
• Key-on wakeup control register K3
• Pull-up control register PU0
• Pull-up control register PU1
• Pull-up control register PU2
• Pull-up control register PU3
• Port output structure control register FR0
• Port output structure control register FR1
• Port output structure control register FR2
• Port output structure control register FR3
• High-order bit reference enable flag (UPTF)
• Carry flag (CY)
• Register A
• Register B
• Register D
• Register E
• Register X
• Register Y
• Register Z
• Stack pointer (SP)
• Operation source clock
• Ceramic resonator circuit
• Low-speed on-chip oscillator
• Quartz-crystal oscillator
Fig 52. Internal state at reset (2)
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0
0
0000
0000
×××
××××××××
0000
0000
××
111
High-speed on-chip oscillator (operating)
Operating
Stop
Operating
“X” represents undefined.
Rev.1.01 Feb 15, 2008 Page 53 of 146
REJ03B0224-0101