參數(shù)資料
型號: MCM16Y1BACFT16
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, MICROCONTROLLER, PQFP160
封裝: QFP-160
文件頁數(shù): 99/138頁
文件大?。?/td> 784K
代理商: MCM16Y1BACFT16
MC68HC16Y1
MOTOROLA
MC68HC16Y1TS/D
63
3.10.2 Pin Assignment Registers
The pin assignment registers contain pairs of bits that determine the functions of chip select pins. Alter-
nate functions of the associated pins are shown in parentheses. Reset value depends on the operating
mode.
In the following register diagrams, reset values are shown in the following order: single-chip modes, par-
tially expanded mode, and fully expanded mode. The notation “DATA#” indicates that a bit goes to the
logic level of that data bus pin on reset. DATA lines have weak pull-ups — during reset in fully expanded
mode, an active external device can pull the data lines low to select alternate functions.
CSPAR0[15:14] — Not used.
These bits always read zero; write has no effect.
CSPAR011 — Not used.
CSPAR010 determines whether pin is FC1 or a discrete output.
CSPAR1[15:10] — Not used.
These bits always read zero; write has no effect. Clearing both CS10 select bits (CSPAR1[9:8]) enables
the M6800 bus clock (ECLK) on ADDR23.
The table below shows pin assignment register encoding.
A pin programmed as a discrete output drives an external signal to the value specified in the Port C data
register (PORTC), with the following exceptions:
No discrete output function is available on pins BR, BG, or BGACK.
ADDR23 provides ECLK output rather than a discrete output signal.
CSPAR0 — Chip Select Pin Assignment Register 0
$YFFA44
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CS5
(FC2)
0
FC1
CS3
(FC0)
CSE
(BGACK)
CSM
(BG)
CS0
(BR)
CSBOOT
RESET:
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
DATA2
1
0
1
DATA2
1
DATA10
1
DATA10
1
DATA2
1
DATA0
CSPAR1 — Chip Select Pin Assignment Register 1
$YFFA46
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CS10
(ADDR23)
CS9
(ADDR22)
CS8
(ADDR21)
CS7
(ADDR20)
CS6
(ADDR19)
RESET:
0
1
0
1
0
1
0
1
0
1
0
1
0
DATA7
1
DATA6
1
DATA5
1
DATA4
1
DATA3
1
Bit Pair
Description
00
Discrete Output
01
Alternate Function
10
Chip Select (8-Bit Port)
11
Chip Select (16-Bit Port)
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