EZ80F91MCU Datasheet, PDF (289/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
270
EMAC Transmit Lower Boundary Pointer Register—Low and High Bytes
The EMAC Transmit Lower Boundary Pointer is set to the start of the Transmit
buffer in EMAC shared memory. See Tables 161 and 162.
Table 161. EMAC Transmit Lower Boundary Pointer Register—Low Byte
(EMAC_TLBP_L = 0042h)
Bit
Reset
CPU Access
Note: R/W = Read/Write.
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
R/W
Bit
Position
[7:0]
EMAC_TLBP_L
Value
00h–
FFh
Description
These bits represent the Low byte of the 2-byte Transmit
Lower Boundary Pointer value, {EMAC_TLBP_H,
EMAC_TLBP_L}. Bit 7 is bit 7 of the 16-bit value. Bit 0 is bit
0 (lsb) of the 16-bit value.
Table 162. EMAC Transmit Lower Boundary Pointer Register—High Byte
(EMAC_TLBP_H = 0043h)*
Bit
7
6
5
4
3
2
1
0
Reset
1
1
0
0
0
0
0
0
CPU Access
R
R
R R/W R/W R/W R/W R/W
Note: R/W = Read/Write.
Bit
Position
Value Description
[7:0]
00h–
EMAC_TLBP_H FFh
These bits represent the High byte of the 2-byte Transmit
Lower Boundary Pointer value, {EMAC_TLBP_H,
EMAC_TLBP_L}. Bit 7 is bit 15 (msb) of the 16-bit value.
Bit 0 is bit 8 of the 16-bit value.
Note: *Bits 7:5 are not used by the EMAC; these bits return 000.
PS019209-0504
PRELIMINARY
Ethernet Media Access Controller