NXP Semiconductors PXN2020, Reference Manual, Page: 376 / 1376

e200z6 Core (Z6)
PXN20 Microcontroller Reference Manual, Rev. 1
13-12 Freescale Semiconductor
— Debug control registers (DBCR0–DBCR2). These registers provide control for enabling and
configuring debug events.
— Debug status register (DBSR). This register contains debug event status.
— Instruction address compare registers (IAC1–IAC4). These registers contain addresses and/or
masks which are used to specify instruction address compare debug events.
— Data address compare registers (DAC1, DAC2). These registers contain addresses and/or
masks which are used to specify data address compare debug events.
— e200z6 does not implement the data value compare registers (DVC1, DVC2).
• Timer registers
— The clock inputs for the timers are connected to the internal system clock.
— Time base (TB). The TB is a 64-bit structure provided for maintaining the time of day and
operating interval timers. The TB consists of two 32-bit registers, time-base upper (TBU) and
time-base lower (TBL). The time-base registers can be written to by supervisor-level software
only, but can be read by both user and supervisor-level software.
— Decrementer register (DEC). This register is a 32-bit decrementing counter that provides a
mechanism for causing a decrementer exception after a programmable delay.
— Decrementer auto-reload (DECAR). This register is provided to support the auto-reload feature
of the decrementer.
— Timer control register (TCR). This register controls decrementer, fixed-interval timer, and
watchdog timer options.
— Timer status register (TSR). This register contains status on timer events and the most recent
watchdog timer-initiated processor reset.
For more details about these registers, refer to the Power Architecture embedded category specifications.
13.2.2 Core-Specific Registers
The Power Architecture embedded category allows implementation-specific registers.
Implementation-specific registers incorporated in the e200z6 core are described in this section.
13.2.2.1 User-Level Registers
The user-level registers can be accessed by all software with either user or supervisor privileges. They
include the following:
• Signal processing extension APU status and control register (SPEFSCR). The SPEFSCR contains
all fixed-point and floating-point exception signal bits, exception summary bits, exception enable
bits, and rounding control bits needed for compliance with the IEEE 754 standard.
• The L1 cache configuration register (L1CFG0). This read-only register allows software to query
the configuration of the L1 unified cache.