System-Protect Function; Control Registers; Misc System Protect Register - Epson S1C17W12 Technical Manual

Peripheral circuit
Sound generator (SNDA)
IR remote controller (REMC2)
LCD driver (LCD4A)
R/F converter (RFC) Ch.0
*1 Not available in the S1C17W12 SQFN7-48PIN package
*2 Not available in the S1C17W13 SQFN7-48PIN package
*3 Not available in the S1C17W13 TQFP12-48PIN package

4.6.1 System-Protect Function

The system-protect function protects control registers and bits from writings. They cannot be rewritten unless write
protection is removed by writing 0x0096 to the MSCPROT.PROT[15:0] bits. This function is provided to prevent
deadlock that may occur when a system-related register is altered by a runaway CPU. See "Control Registers" in
each peripheral circuit to identify the registers and bits with write protection.
Note: Once write protection is removed using the MSCPROT.PROT[15:0] bits, write enabled status is
maintained until write protection is applied again. After the registers/bits required have been al-
tered, apply write protection.

4.7 Control Registers

MISC System Protect Register

Register name Bit
MSCPROT 15–0 PROT[15:0]
Bits 15–0 PROT[15:0]
These bits protect the control registers related to the system against writings.
0x0096 (R/W):
Other than 0x0096 (R/W): Enable system protection
S1C17W12/W13 TECHNICAL MANUAL
(Rev. 1.2)
Address
0x5300 SNDCLK SNDA Clock Control Register
0x5302 SNDSEL SNDA Select Register
0x5304 SNDCTL SNDA Control Register
0x5306 SNDDAT SNDA Data Register
0x5308 SNDINTF SNDA Interrupt Flag Register
0x530a SNDINTE SNDA Interrupt Enable Register
0x5320 REMCLK REMC2 Clock Control Register
0x5322 REMDBCTL REMC2 Data Bit Counter Control Register
0x5324 REMDBCNT REMC2 Data Bit Counter Register
0x5326 REMAPLEN REMC2 Data Bit Active Pulse Length Register
0x5328 REMDBLEN REMC2 Data Bit Length Register
0x532a REMINTF REMC2 Status and Interrupt Flag Register
0x532c REMINTE REMC2 Interrupt Enable Register
0x5330 REMCARR REMC2 Carrier Waveform Register
0x5332 REMCCTL REMC2 Carrier Modulation Control Register
0x5400 LCD4CLK LCD4A Clock Control Register
0x5402 LCD4CTL LCD4A Control Register
0x5404 LCD4TIM1 LCD4A Timing Control Register 1
0x5406 LCD4TIM2 LCD4A Timing Control Register 2
0x5408 LCD4PWR LCD4A Power Control Register
0x540a LCD4DSP LCD4A Display Control Register
0x540c LCD4COMC0 LCD4A COM Pin Control Register 0
0x5410 LCD4INTF LCD4A Interrupt Flag Register
0x5412 LCD4INTE LCD4A Interrupt Enable Register
0x5440 RFC0CLK RFC Ch.0 Clock Control Register
0x5442 RFC0CTL RFC Ch.0 Control Register
0x5444 RFC0TRG RFC Ch.0 Oscillation Trigger Register
0x5446 RFC0MCL RFC Ch.0 Measurement Counter Low Register
0x5448 RFC0MCH RFC Ch.0 Measurement Counter High Register
0x544a RFC0TCL RFC Ch.0 Time Base Counter Low Register
0x544c RFC0TCH RFC Ch.0 Time Base Counter High Register
0x544e RFC0INTF RFC Ch.0 Interrupt Flag Register
0x5450 RFC0INTE RFC Ch.0 Interrupt Enable Register
Bit name Initial
0x0000
Disable system protection
Seiko Epson Corporation
Register name
*3
Reset R/W
H0 R/W –
4 MEMORY AND BUS
*3
*3
*3
*3
*3
*3
*3
*3
Remarks
4-7