STC8A8K64D4 Series Manual
power-down wake-up timer).................................................................................................................. 92
6.7.13 Wake up MCU from Power Saving Mode using comparator interrupt ( Recommended for use
with power-down wake-up timer) ......................................................................................................... 95
6.7.14 Detect the Operating Voltage (Battery Voltage) using LVD ....................................................... 97
7 Memory
........................................................................................................................................................102
7.1 Program Memory ..................................................................................................................................102
7.2 Data Memory ........................................................................................................................................102
7.2.1 Internal RAM ...............................................................................................................................103
7.2.2 PSW (program status word register) ............................................................................................103
7.2.3 On-chip extended RAM...............................................................................................................104
7.2.4 Auxiliary register (AUXR) ..........................................................................................................104
7.2.6 Bus speed control register (BUS_SPEED) ................................................................................105
7.2.7 Bit Addressable Data Memory in 8051 .......................................................................................105
7.3 Special parameters of memory ..............................................................................................................107
7.4 Unique ID number and important parameter (CHIPID) stored in read-only special function register .109
7.4.1 Interpretation of Global Unique ID Number in CHIP .................................................................109
7.4.2 Interpretation of the internal reference signal source in CHIP .................................................... 110
7.4.3 Interpretation of internal 32K IRC oscillation frequency in CHIP .............................................. 110
7.4.4 Interpretation of high precision IRC parameters in CHIP ........................................................... 110
7.4.5 Interpretation of test time parameters in CHIP ............................................................................ 111
7.4.6 Interpretation of chip package form number in CHIP ................................................................. 111
7.5 Example Routines ................................................................................................................................. 112
7.5.1 Read Internal Referrence Voltage Value (Read from CHIPID) ................................................... 112
7.5.2 Read Internal Referrence Voltage (from Flash) ........................................................................... 115
7.5.3 Read Internal Referrence Voltage (Read from RAM) ................................................................. 118
7.5.4 Read the Unique ID (Read from CHIPID) ..................................................................................121
7.5.5 Read the Unique ID (Read from Flash) .......................................................................................124
7.5.6 Read the Unique ID (Read from RAM) ......................................................................................127
7.5.7 Read the Frequency of 32K Power-down Wake-up Timer (Read from CHIPID) .......................130
7.5.8 Read the Frequency of 32K Power-down Wake-up Timer (Read from Flash) ............................134
7.5.9 Read the Frequency of 32K Power-down Wake-up Timer (Read from RAM) ...........................137
7.5.10 Read the User-defined internal IRC Frequency (Read from CHIPID) ......................................140
7.5.11 Read the User-defined internal IRC Frequency (Read from Flash) ...........................................146
7.5.12 Read the User-defined internal IRC Frequency (Read from RAM) ..........................................152
8 Special Function Registers ...........................................................................................................................154
8.1 STC8A8K64D4-64Pin/48Pin family ....................................................................................................154
8.2 List of Special Function Registers ........................................................................................................156
9 I/O Ports 164
9.1 Registers Related to I/O ........................................................................................................................164
9.1.1 Port Data Register (Px) ................................................................................................................165
9.1.2 Ports Mode Registers (PxM0, PxM1) ..........................................................................................165
9.1.3 Pull-up Resistor Control Registers (PxPU) .................................................................................166
9.1.4 Schmitt Trigger Control Registers (PxNCS) ...............................................................................166
9.1.5 Level Shifting Speed Control Registers (PxSR) ..........................................................................166
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