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Peripheral Control Block
4-6
4.1.3 Processor Release Level Register (PRL, Offset F4h)
The Processor Release Level (PRL) Register (Figure 4-4) is a read-only register that
specifies the processor version. The format of the Processor Release Level Register is
shown in Figure 4-4.
Figure 4-4 Processor Release Level Register (PRL, offset F4h)
The values of the PRL Register bits 15–8 are listed in Table 4-1.
Bits 15–9: Processor Release Level (PRL)—This field is a 7-bit, read-only identification
number that specifies the processor release level for either the Am186ER or Am188ER
microcontroller. Each release level is numbered one higher than the previous level.
Bit 8:—This bit is 0 in the Am186ER microcontroller. This bit is 1 in the Am188ER
microcontroller.
The values of bits 15–8 of the PRL Register for the Am186ER and Am188ER
microcontrollers are shown in Table 4-1.
Table 4-1 Processor Release Level (PRL) Register High-Order Byte Values
Bits 7–0: Reserved—Value is undefined
Bits 15–8 Processor Release Level
20h Am186ER revision A
21h Am188ER revision A
15
70
186/188
Reserved
PRL